Submarine pipeline deflection connection structure

Abstract

The invention relates to the technical field of subsea pipeline connection, and provides a subsea pipeline deflection connection structure. The two connecting flanges are arranged on the two pipeline joints in a sliding and sleeving mode respectively, the limiting assemblies are arranged on the pipeline joints to limit the sliding range of the connecting flanges, the fixing assemblies are used for fixing the two connecting flanges, and the sealing assemblies are used for sealing the two pipeline joints. The inner diameter of the connecting flange is larger than the outer diameter of the pipeline connector, and a certain fault-tolerant space is provided for the pipeline connector. By arranging the connecting flange and the limiting assembly which are arranged in a sliding and sleeving mode, a fault-tolerant space is provided for the pipeline connector, the pipelines are allowed to be obliquely connected within a certain threshold range, and the adaptability of the connecting structure to complex working conditions is improved; and through cooperation of the alignment pins and the pin holes, it is ensured that the two connecting flanges can be rapidly aligned during installation, and the assembling efficiency and precision are improved.

Description

Technical Field

[0001] The present application relates to the technical field of submarine pipeline connection, and in particular to a submarine pipeline deflection connection structure. Background Art

[0002] Connecting flanges (pipe fittings) are common hardware components in modern oil and gas engineering. Their core function is to securely connect pipelines and risers. Mechanical connectors provide a safe, reliable, and reversible connection method, and the mechanical connection between two bare pipe ends is equivalent to a good welded joint. Connecting flanges should provide a seal that adapts to the pipeline medium and application pressure, and have a clamping capacity that can accommodate pressure and external loads.

[0003] In offshore pipeline maintenance, particularly in complex and large-scale scenarios, when connecting pipelines using connecting flanges, existing domestic pipe ends require perfect alignment of the flanges during installation, ensuring alignment of the bolt holes of the two flanges before tightening. However, in actual underwater operations, due to the heavy weight of the pipeline and the flow of seawater, perfect flange alignment is difficult, resulting in extremely low efficiency and a need for further improvement. Summary of the Invention

[0004] In order to solve the above problems, the present application provides a submarine pipeline deflection connection structure.

[0005] This application provides a submarine pipeline deflection connection structure, which adopts the following technical solutions: The cam is secured to the side of the second end of the pipe and is secured to a location where the cam is secured, the cam having two or more members connected thereto. The cam is secured to the side of the second end of the pipe and is secured to a location where the cam is secured.

[0006] By adopting the above technical solution, by making the inner diameter of the connecting flange larger than the outer diameter of the pipe joint, a fault tolerance space is provided for the pipe joint, so that the connecting flange can adapt to the deflection of the pipe joint within a certain threshold range, thereby realizing an oblique connection, so that the pipe joints can be connected and locked without being completely aligned when connected relative to each other, simplifying the installation method to improve the construction efficiency on the seabed. Since the connecting flange and the pipe joint are movably connected, in order to reduce the possibility of the pipe joint slipping and detaching, a limiting ring is provided, and its cooperation with the first ring groove limits the slipping and detaching of the pipe joint, and the sliding connection design of the first guide surface and the second guide surface further enhances the stability of the connection, and can make the deflection of the pipe joint relatively convenient to achieve deflection. This solution improves the adaptability and reliability of submarine pipeline connections as a whole, and is particularly suitable for marine pipeline maintenance scenarios under complex working conditions.

[0007] When connecting, the two connecting flanges still need to be aligned to maintain the connection strength and stability. To this end, by providing alignment pins and pin holes on the connecting flanges, when fixing them through the fixing assembly, the alignment pins and pin holes are first inserted and connected to achieve the effect of pre-positioning, thereby improving the probability of accurate alignment of the two connecting flanges during assembly and the reliability of the connection.

[0008] Preferably, the end surfaces of the two connecting flanges are provided with grooves, the connecting flanges are provided with sealing gaskets located in the grooves, and the sealing gaskets are provided with a first through hole connected to the pin hole.

[0009] By adopting the above technical solution, a groove is formed on the end surface of the connecting flange and a sealing gasket is placed in the groove, which can effectively improve the sealing performance between the connecting flanges. At the same time, the first through-hole formed in the sealing gasket is connected to the pin hole, which allows the alignment pin to be inserted into the pin hole relatively smoothly, achieving precise alignment of the two connecting flanges and thus improving the reliability of the connection.

[0010] Preferably, the two limiting rings are respectively a first limiting ring and a second limiting ring, the end face of the first limiting ring is protruding with a plug-in ring, the second limiting ring is provided with a second ring groove for inserting the plug-in ring, the cross-section of the plug-in ring gradually increases towards the direction approaching the first limiting ring, and the outer diameter of the plug-in ring is larger than the outer diameter of the second ring groove at the notch.

[0011] By adopting this technical solution, the coupling between the plug-in ring and the second ring groove enables relatively precise positioning and stable connection of the two retaining rings. Furthermore, the gradually increasing cross-section of the plug-in ring enhances the tightness of the connection, effectively preventing loosening and detachment at the connection, and improving the reliability of the overall structure. Specifically, the outer diameter of the plug-in ring is larger than the outer diameter of the second ring groove at the notch to facilitate a certain angle of deflection.

[0012] Preferably, the sealing assembly includes two sealing rings respectively wrapped around the inner walls of the two pipe joints and a sealing member abutting the inner walls of the sealing rings, the sealing member includes a sealing ring body and a third limiting ring arranged on the outer peripheral wall of the sealing ring body, the inner wall of the first limiting ring is provided with a first inclined surface for the sealing ring body to slide and abut, the first inclined surface extends to the side wall of the plug-in ring, the inner wall of the second limiting ring is provided with a second inclined surface for the sealing ring body to slide and abut, the two sealing rings are respectively provided on the first inclined surface and the second inclined surface; the first inclined surface is provided with a third ring groove for the third limiting ring to be embedded.

[0013] By adopting the above technical solution, the sealing assembly achieves sealing of the pipe joint by providing two sealing rings and a sealing member. The sealing member includes a sealing ring body and a third retaining ring. The inner wall of the first retaining ring is provided with a first inclined surface, and the inner wall of the second retaining ring is provided with a second inclined surface. This allows the sealing ring body to slide and abut against the first and second inclined surfaces, respectively. This allows the pipe joint to continue to seal even after a certain degree of deflection within the connecting flange, thereby improving the stability of the sealing effect. In addition, the provision of the third annular groove can limit the sliding range of the sealing member within the pipe joint and further enhance the matching precision between the sealing ring body and the first inclined surface.

[0014] Preferably, chamfered portions are provided on the edges of the two opposite ends of the sealing ring body, and a deformation groove is provided around the inner peripheral wall of the sealing ring body, and the deformation groove is provided corresponding to the chamfered portion.

[0015] By adopting this technical solution, chamfered edges are provided at opposite ends of the sealing ring body, effectively reducing frictional resistance during installation and improving assembly efficiency. Furthermore, deformation grooves are provided around the inner circumference of the sealing ring body, corresponding to the chamfered edges. This allows the sealing ring body to have greater elastic deformation capability under pressure, thereby enhancing the sealing effect and ensuring a reliable seal at the pipe connection.

[0016] Preferably, the sealing assembly further includes a rubber layer arranged outside the sealing member.

[0017] By adopting this technical solution, the addition of a rubber layer to the seal further enhances the sealing performance of the connection structure. The rubber layer possesses excellent elasticity and wear resistance, effectively filling the tiny gap between the seal and the pipe joint when subjected to external pressure, thereby reducing the risk of media leakage. Furthermore, the rubber layer cushions the seal from external impact, enhancing the stability and durability of the overall connection structure under complex operating conditions.

[0018] Preferably, the third limiting ring is provided with a groove along its radial direction, and the groove extends to the inner circumferential wall of the sealing ring body to divide the sealing part into two sealing parts with an L-shaped cross-section, and the first limiting ring is provided with a first pushing member for pushing the two sealing parts to move away from each other.

[0019] By adopting the above technical solution, when the pipe joint connection deflects, the seal is subjected to uneven pressure at both ends, resulting in sealing problems due to a lack of tight contact. To address this, a groove is cut to separate the seal into two sealing parts with an L-shaped cross-section. This allows the seal to better adapt to the deflection connection requirements between pipe joints and enhances its deformation capacity, thereby improving its sealing performance under different working conditions. To enhance the corresponding sealing ability, a first pusher is provided to further improve the sealing performance of the two sealing parts, thereby enhancing the applicability and safety of the entire submarine pipeline deflection connection structure.

[0020] Preferably, the rubber layer is provided with a fourth annular groove near the outer peripheral wall of the third limiting ring, and the fourth annular groove is connected to the cut groove; the first pushing member includes a push rod inserted in the cut groove and a first push rod that pushes the push rod to move toward the sealing portion, and the diameter of the push rod itself gradually increases in the direction away from the sealing portion, and the first limiting ring is provided with a first through groove for inserting the push rod at the third annular groove, and the end face of the first limiting ring away from the plug-in ring is provided with a second through groove connected to the first through groove; the push rod is provided with a third guide surface at one end away from the sealing portion, and the first push rod is semicircular at one end close to the push rod, the first push rod is a screw, and the second through groove is a threaded hole. The number of the first push rods corresponds to the alignment pin setting.

[0021] By adopting the above technical solution, the gradual change in the diameter of the push rod and the introduction of the third guide surface reduce frictional resistance during movement and improve operational smoothness. As a result, under the push of the first push rod, the push rod effectively pushes the sealing portion, allowing the sealing portions to move away from each other, thereby enhancing the sealing effect. The first push rod is in the form of a screw and is mated with the threaded hole of the second slot, ensuring stability and precision during the pushing process.

[0022] Preferably, the sealing ring body includes a plurality of arc-shaped pieces, the axes of the plurality of arc-shaped pieces are arranged outward, a deformation gap is left between two adjacent arc-shaped pieces, both ends of the arc-shaped pieces have protruding abutting parts, the two abutting parts abut against the first inclined surface and the second inclined surface respectively, the third limiting ring includes a plurality of limiting plugs, the number of the limiting plugs corresponds to the setting of the arc-shaped pieces, and the first limiting ring is provided with a second pushing member for driving the arc-shaped ring plate to move toward the direction close to the first limiting ring.

[0023] By adopting the above technical solution, the sealing ring body is composed of a number of arc-shaped pieces, the axes of the arc-shaped pieces are set outward and a deformation gap is left between two adjacent arc-shaped pieces, so that the sealing ring body can be deformed when subjected to external force, thereby better adapting to the deflection connection between pipe joints. The abutting parts at both ends of the arc-shaped piece abut against the sealing rings on the first inclined surface and the second inclined surface respectively, further enhancing the sealing effect and improving the structural stability. The third limiting ring includes a number of limiting plugs corresponding to the arc-shaped pieces, which can effectively limit the position of the arc-shaped piece and reduce the possibility of dislocation during the deformation process. The second pusher on the first limiting ring drives the arc ring plate to move in the direction close to the first limiting ring, which helps to enhance the sealing performance of the sealing ring body and ensure a reliable connection between the pipe joints.

[0024] Preferably, the sealing member further includes a fourth limiting ring arranged on the inner peripheral wall of the sealing ring body.

[0025] By adopting the above technical solution, the fourth limiting ring is set on the inner wall of the sealing ring body, which can further improve the structural stability of the seal, effectively reduce the radial displacement of the seal during the pressure process, thereby ensuring the reliability of the sealing effect, and can provide a certain support for the seal when it is deformed under pressure, thereby enhancing the overall performance of the sealing assembly, so that the connection structure can still maintain a good sealing state under complex working conditions, and extend its service life.

[0026] In summary, this application has the following beneficial effects: 1. The sliding sleeve connection flange and limit assembly provide a fault tolerance space for the pipe joint, allowing the pipe to be connected obliquely within a certain threshold range, thereby improving the adaptability of the connection structure to complex working conditions. 2. The use of alignment pins and pin holes ensures that the two connecting flanges can be quickly aligned during installation, improving assembly efficiency and accuracy; 3. The multi-stage sealing structure, including components such as sealing rings, seals and rubber layers, effectively enhances the sealing performance of the connection parts and ensures reliable sealing effect under high pressure and complex external load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic cross-sectional structural diagram of Example 1 of the present application; Figure 2 is a schematic top view of the structure of Example 1 of the present application; Figure 3 This is a schematic cross-sectional view of the alignment pin inserted into the pin hole in Example 1 of the present application; Figure 4 yes Figure 2 A partial enlarged schematic diagram of part A; Figure 5This is a schematic cross-sectional view of a pipe interface in Example 1 of the present application showing deflection; Figure 6 is a schematic diagram of the cross-sectional structure of the rubber layer in Example 2 of the present application; Figure 7 This is a schematic structural diagram of the first pusher in Example 3 of the present application; Figure 8 This is a structural diagram of the second pushing member in Example 4 of the present application.

[0028] Explanation of reference numerals: 1. pipe joint; 2. connecting flange; 21. alignment pin; 22. pin hole; 23. groove; 24. sealing gasket; 241. first through-hole; 25. first annular groove; 251. first guide surface; 26. second through-hole; 3. limiting assembly; 31. annular protrusion; 32. flange fixing ring; 321. arcuate ring; 322. fixing plate; 323. limiting plate; 324. slot; 33. fixing member; 4. fixing assembly; 41. screw; 42. second nut; 5. sealing assembly; 51. sealing ring; 52. sealing member; 521. sealing ring body; 5211. chamfered portion; 5212. deformation groove; 5213. arcuate sheet; 5214. deformation gap; 5215. abutting portion; 52 2. Third limiting ring; 5221. Cutting groove; 5222. Limiting plug; 53. Rubber layer; 531. Fourth ring groove; 54. Sealing part; 55. Fourth limiting ring; 6. Limiting ring; 61. Second guide surface; 62. First limiting ring; 621. Connecting ring; 622. First inclined surface; 623. Mounting groove; 624. Third ring groove; 625. Discharge port; 626. First through-groove; 627. Second through-groove; 628. Third through-groove; 629. Fourth through-groove; 63. Second limiting ring; 631. Second ring groove; 632. Second inclined surface; 7. First pushing member; 71. Push rod; 711. Third guide surface; 72. First pushing rod; 8. Second pushing member; 81. Guide block; 82. Second pushing rod. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-8 , further details of this application are given.

[0030] An embodiment of the present application discloses a submarine pipeline deflection connection structure. Example 1

[0031] A submarine pipeline deflection connection structure, referring to Figure 1 、 Figure 2 It includes two connecting flanges 2 that are respectively slidably mounted on two pipe joints 1, a limiting component 3 arranged on the pipe joint 1 to limit the sliding range of the connecting flanges 2, a fixing component 4 for fixing the two connecting flanges 2, and a sealing component 5 for sealing the two pipe joints 1.

[0032] One of the connecting flanges 2 is fixedly connected to a plurality of alignment pins 21 spaced about its axis. The other connecting flange 2 is provided with pin holes 22 that mate with the alignment pins 21. Inserting the alignment pins 21 into the pin holes 22 ensures that the two connecting flanges 2 are at the same height, thereby achieving precise docking. In this embodiment, the alignment pins 21 are made of metal, and the end surface of the alignment pin 21 near the pin hole 22 is trapezoidal, so that the diameter of the alignment pin 21 gradually increases as it moves away from the pin hole 22, facilitating smooth insertion into the pin hole 22.

[0033] The end surfaces of the two connecting flanges 2 are provided with grooves 23, and a sealing gasket 24 is disposed within the grooves 23. The sealing gasket 24 has a first through-hole 241 that is connected to the pin hole 22. The elastic properties of the sealing gasket 24 can compensate for slight deflections between the connecting flanges 2 to a certain extent, thereby enhancing the reliability of the connection.

[0034] Among them, the inner diameter of the connecting flange 2 is larger than the outer diameter of the pipe joint 1, providing a certain amount of tolerance for the pipe joint 1. The end faces of the two pipe joints 1 that are close to each other are both provided with a limit ring 6. The inner wall of the connecting flange 2 is correspondingly provided with a first annular groove 25 for inserting the limit ring 6. The two limit rings 6 are respectively provided on the end faces of the two pipe joints 1. In this embodiment, the inner diameter of the first annular groove 25 is larger than the outer diameter of the limit ring 6. The inner walls of the two first annular grooves 25 that are separated from each other are provided with a first guide surface 251. The limit ring 6 is correspondingly provided with a second guide surface 61 that is slidably connected to the first guide surface 251. It should be noted that both the first guide surface 251 and the second guide surface 61 adopt a smooth inclined surface design to facilitate the sliding connection of the limit ring 6.

[0035] Specifically, the two limiting rings 6 are the first limiting ring 62 and the second limiting ring 63. The end face of the first limiting ring 62 is protruding with a plug-in ring 621. The cross-section of the plug-in ring 621 gradually increases towards the direction approaching the first limiting ring 62, forming a conical structure. The second limiting ring 63 is provided with a second ring groove 631 for the plug-in ring 621 to be inserted. The outer diameter of the plug-in ring 621 is larger than the outer diameter of the second ring groove 631 at the groove mouth.

[0036] Reference Figure 2 、 Figure 3The flange fixing ring 32 is fixed on the annular protrusion 31 through the fixing member 33. The flange fixing ring 32 is fixed on the annular protrusion 31 through the fixing member 33. The flange fixing ring 32 is fixed on the annular protrusion 31 through the fixing member 33. The flange fixing ring 32 is specifically composed of two arc rings 321, fixing plates 322 arranged at the ends of the arc rings 321 and a limiting block arranged in the middle of the arc ring 321. The inner walls of the two arc rings 321 are provided with a card groove 324 for the annular protrusion 31 to be embedded. The limiting block and the fixing plate 322 are arranged so that the outer diameter of the flange fixing ring 32 is larger than the inner diameter of the end face of the connecting flange 2 close to the flange fixing ring 32, thereby limiting the sliding range of the connecting flange 2. The fixing member 33 is specifically a bolt, which is passed through the fixing plate 322 at the end of one of the arc-shaped rings 321 and then threadedly connected to the fixing plate 322 on the other arc-shaped ring 321 .

[0037] In this embodiment, the fixing assembly 4 is provided at intervals around the axis of the connecting flange 2. Specifically, the fixing assembly 4 includes a screw 41 and a second nut 42. The connecting flange 2 is provided with a plurality of second through-holes 26 spaced apart along its axis for the screws 41 to pass through. The screws 41 and the second nuts 42 are used to secure the two connecting flanges 2 together. The screws 41 can be made of high-strength steel, and the second nuts 42 can be made of corrosion-resistant material to ensure a reliable connection. Furthermore, the fixing assembly 4 can be replaced with a snap-on connector or clamping device to accommodate different installation requirements.

[0038] Reference Figure 2 、 Figure 4 , wherein the sealing assembly 5 includes two sealing rings 51 respectively wrapped around the inner walls of the two pipe joints 1 and a sealing member 52 abutting against the inner wall of the sealing ring 51, the inner wall of the first limiting ring 62 is provided with a first inclined surface 622, the first inclined surface 622 extends to the side wall of the plug-in ring 621, the inner wall of the second limiting ring 63 is provided with a second inclined surface 632, the two sealing rings 51 are respectively provided on the first inclined surface 622 and the second inclined surface 632, and the first limiting ring 62 is located on the first inclined surface 622 and has an installation groove 623 for installing the sealing ring 51.

[0039] Among them, the sealing member 52 specifically includes a sealing ring body 521 and a third limiting ring 522 fixedly connected to the outer peripheral wall of the sealing ring body 521. The edges of the opposite ends of the sealing ring body 521 are provided with chamfered portions 5211, and a deformation groove 5212 is provided around the inner peripheral wall. The deformation groove 5212 is provided corresponding to the chamfered portion 5211. This design enables the sealing ring body 521 to undergo elastic deformation when subjected to pressure, thereby better adapting to the deflection between the pipe joints 1. Among them, the first inclined surface 622 is provided with a third annular groove 624 for the third limiting ring 522 to be embedded in, so as to limit the deflection of the sealing ring body 521, so that the sealing ring body 521 can always be coaxially arranged with the pipe joint 1 provided with the third annular groove 624, such as Figure 5 shown.

[0040] Furthermore, a drain port 625 is formed on the inner wall of the third annular groove 624 of the first retaining ring 62, extending to the outer peripheral wall of the first retaining ring 62. The provision of the drain port 625 is primarily intended to balance the pressure inside and outside the third annular groove 624. Because this connection structure is suitable for use on the seabed, where the pressure difference between the inside and outside is relatively large, the provision of the drain port 625 allows a small amount of fluid to pass when the internal pressure of the pipeline changes, thereby reducing the pressure difference inside and outside the third annular groove 624 and minimizing the possibility of the sealing ring body 521 being squeezed, deformed, or damaged, thereby affecting the sealing effect between the two pipe joints 1. The drain port 625 also allows the sealing ring body 521 to have a certain amount of room to move when the pressure changes, reducing the excessive friction between the sealing ring body 521 and the third annular groove 624 caused by the pressure difference, which could cause the sealing ring body 521 to become stuck in the third annular groove 624 due to long-term pressure, especially when the internal pressure of the pipeline is high or the fluid viscosity is high.

[0041] The implementation principle of a submarine pipeline deflection connection structure in an embodiment of the present application is as follows: by making the inner diameter of the connecting flange 2 larger than the outer diameter of the pipe joint 1, a fault tolerance space is provided for the pipe joint 1, so that the connecting flange 2 can adapt to the deflection of the pipe joint 1 within a certain threshold range, thereby realizing an oblique connection, so that the pipe joints 1 can be connected and locked when they are relatively connected without being completely aligned, simplifying the installation method to improve the construction efficiency of the seabed. When connecting, the two connecting flanges 2 still need to be aligned to maintain the connection strength and stability. To this end, by providing an alignment pin 21 and a pin hole 22 on the connecting flange 2, when fixing it through the fixing assembly 4, the alignment pin 21 and the pin hole 22 are first inserted and connected to perform a pre-positioning effect, thereby improving the probability of accurate alignment of the two connecting flanges 2 during assembly and the reliability of the connection. Example 2

[0042] Reference Figure 6, differing from Example 1 in that the sealing assembly 5 further includes a rubber layer 53 disposed outside the sealing element 52. The rubber layer 53 exhibits excellent elasticity and wear resistance, effectively filling the small gap between the sealing element 52 and the pipe joint 1 when subjected to external pressure, thereby reducing the risk of medium leakage. Furthermore, the rubber layer 53 cushions the impact of the external environment on the sealing element 52, enhancing the stability and durability of the overall connection structure under complex operating conditions. Example 3

[0043] Reference Figure 7 , the difference from Example 2 is that the third limiting ring 522 is provided with a groove 5221 along its radial direction, the groove depth of the groove 5221 gradually decreases towards the direction approaching the sealing ring body 521, and the groove 5221 extends to the inner peripheral wall of the sealing ring body 521 to divide the sealing member 52 into two sealing portions 54 with an L-shaped cross-section. The first limiting ring 62 is provided with a first pushing member 7 for pushing the two sealing portions 54 to move away from each other, and the rubber layer 53 is provided with a fourth annular groove 531 around the outer peripheral wall near the third limiting ring 522, and the fourth annular groove 531 is connected to the groove 5221.

[0044] The first push member 7 specifically includes a push rod 71 inserted in the cutting groove 5221 and a first push rod 72 that pushes the push rod 71 to move toward the sealing portion 54. The first limiting ring 62 is located at the third ring groove 624 and is provided with a first through groove 626 for the push rod 71 to be inserted. The end surface of the first limiting ring 62 away from the plug-in ring 621 is provided with a second through groove 627 connected to the first through groove 626. The first push rod 72 is provided with the second through groove 627. The diameter of the push rod 71 itself gradually increases in the direction away from the sealing portion 54. The end of the push rod 71 away from the sealing portion 54 is provided with a third guide surface 711, and the end of the first push rod 72 close to the push rod 71 is semicircular. In this embodiment, the first push rod 72 is a screw 41 or a bolt, the second through groove 627 is a threaded hole, and the number of the first push rods 72 corresponds to the alignment pin 21.

[0045] Furthermore, the sealing member 52 further includes a fourth limiting ring 55 disposed on the inner peripheral wall of the sealing ring body 521 to provide certain support for the sealing ring body 521 and reduce the possibility of deformation. Example 4

[0046] Reference Figure 8The difference from Example 3 is that the sealing ring body 521 includes a plurality of interconnected arc-shaped pieces 5213. In this embodiment, the arc-shaped pieces 5213 are made of elastic steel, wherein the axes of the plurality of arc-shaped pieces 5213 are arranged outward, and a deformation gap 5214 is left between two adjacent arc-shaped pieces 5213. Both ends of the arc-shaped pieces 5213 are protruding with abutting portions 5215. The cross-section of the abutting portions 5215 is arranged in an arc shape, and the axis of the abutting portions 5215 is arranged toward away from the sealing ring 51. The two abutting portions 5215 are respectively used to abut the sealing ring 51 on the first inclined surface 622 and the second inclined surface 632.

[0047] Among them, the third limiting ring 522 includes a plurality of limiting plugs 5222, the number of which corresponds to the setting of the arc piece 5213, and the first limiting ring 62 is provided with a second pushing member 8 for driving the arc ring 321 plate to move toward the direction close to the first limiting ring 62.

[0048] In this embodiment, the second pushing member 8 includes a guide block 81 arranged on the limiting plug 5222 and a second pushing rod 82 abutting against the guide block 81. The width of the guide block 81 itself gradually increases in the direction away from the arc-shaped piece 5213. The first limiting ring 62 is located at the third ring groove 624 and is provided with a third through groove 628 for inserting the upper part of the limiting plug 5222 and the guide block 81. The end face of the first limiting ring 62 away from the plug-in ring 621 is provided with a fourth through groove 629 connected to the third through groove 628. The second pushing rod 82 is passed through the fourth through groove 629. In this embodiment, the second pushing rod 82 is a screw rod 41 or a bolt setting, the second through groove 627 is a threaded hole setting, and the number of the second pushing rods 82 corresponds to the alignment pin 21 setting.

[0049] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A submarine pipeline deflection connection structure, characterized by: The invention comprises two connecting flanges (2) respectively slidably sleeved on two pipe joints (1), a limiting assembly (3) arranged on the pipe joint (1) to limit the sliding range of the connecting flanges (2), a fixing assembly (4) for fixing the two connecting flanges (2), and a sealing assembly (5) for sealing the two pipe joints (1); the inner diameter of the connecting flange (2) is larger than the outer diameter of the pipe joint (1), providing a certain fault tolerance space for the pipe joint (1); the end faces of the two pipe joints (1) close to each other are each provided with a limiting ring (6), and the inner wall of the connecting flange (2) is correspondingly opened. A first annular groove (25) is provided for inserting a limiting ring (6), the inner diameter of the first annular groove (25) is larger than the outer diameter of the limiting ring (6), and the inner walls of the two first annular grooves (25) that are away from each other are provided with a first guide surface (251), and the limiting ring (6) is provided with a second guide surface (61) that is slidably connected to the first guide surface (251); one of the connecting flanges (2) is provided with an alignment pin (21), and a plurality of the alignment pins (21) are arranged at intervals around the axis of the connecting flange (2); the other connecting flange (2) is provided with a pin hole (22) for inserting the alignment pin (21).

2. The submarine pipeline deflection connection structure according to claim 1, characterized in that: The end surfaces of the two connecting flanges (2) are provided with grooves (23), the connecting flanges (2) are provided with sealing gaskets (24) in the grooves (23), and the sealing gaskets (24) are provided with first through holes (241) connected to the pin holes (22).

3. The submarine pipeline deflection connection structure according to claim 1, characterized in that: The two limiting rings (6) are respectively a first limiting ring (62) and a second limiting ring (63); the end surface of the first limiting ring (62) is provided with a plug-in ring (621); the second limiting ring (63) is provided with a second ring groove (631) for inserting the plug-in ring (621); the cross section of the plug-in ring (621) gradually increases in a direction approaching the first limiting ring (62); the outer diameter of the plug-in ring (621) is larger than the outer diameter of the second ring groove (631) at the notch.

4. The submarine pipeline deflection connection structure according to claim 3, characterized in that: The sealing assembly (5) comprises two sealing rings (51) respectively arranged around the inner walls of the two pipe joints (1) and a sealing member (52) abutting against the inner walls of the sealing rings (51); the sealing member (52) comprises a sealing ring body (521) and a third limiting ring (522) arranged on the outer peripheral wall of the sealing ring body (521); the inner wall of the first limiting ring (62) is provided with a first inclined surface (622) for the sealing ring body (521) to slide and abut against, and the first inclined surface (622) extends to the side wall of the plug-in ring (621); the inner wall of the second limiting ring (63) is provided with a second inclined surface (632) for the sealing ring body (521) to slide and abut against, and the two sealing rings (51) are respectively arranged on the first inclined surface (622) and the second inclined surface (632); the first inclined surface (622) is provided with a third ring groove (624) for the third limiting ring (522) to be engaged.

5. The submarine pipeline deflection connection structure according to claim 4, characterized in that: The edges of both ends of the sealing ring body (521) are provided with chamfered portions (5211), and the inner peripheral wall of the sealing ring body (521) is provided with a deformation groove (5212), and the deformation groove (5212) is provided corresponding to the chamfered portion (5211).

6. The submarine pipeline deflection connection structure according to claim 4, characterized in that: The sealing assembly (5) further includes a rubber layer (53) arranged outside the sealing member (52).

7. The submarine pipeline deflection connection structure according to claim 6, characterized in that: The third limiting ring (522) is provided with a groove (5221) along its radial direction, and the groove (5221) extends to the inner peripheral wall of the sealing ring body (521) to divide the sealing member (52) into two sealing portions (54) with an L-shaped cross section. The first limiting ring (62) is provided with a first pushing member (7) for pushing the two sealing portions (54) to move away from each other.

8. The submarine pipeline deflection connection structure according to claim 7, characterized in that: The rubber layer (53) is provided with a fourth annular groove (531) near the outer peripheral wall of the third limiting ring (522), and the fourth annular groove (531) is connected to the cutting groove (5221); the first pushing member (7) includes a push rod (71) inserted into the cutting groove (5221) and a first pushing rod (72) for pushing the push rod (71) to move toward the sealing portion (54), and the diameter of the push rod (71) itself gradually increases in the direction away from the sealing portion (54). The first limiting ring (62) is provided with a push rod (71) at the third annular groove (624) for the push rod ( The first limiting ring (62) is provided with a first through groove (626) inserted in the plug-in ring (621), and the end surface of the first limiting ring (62) away from the plug-in ring (621) is provided with a second through groove (627) connected to the first through groove (626); the end of the push rod (71) away from the sealing portion (54) is provided with a third guide surface (711), and the end of the first push rod (72) close to the push rod (71) is semicircular, the first push rod (72) is a screw rod (41), and the second through groove (627) is a threaded hole. The number of the first push rods (72) corresponds to the setting of the alignment pin (21).

9. The submarine pipeline deflection connection structure according to claim 4, characterized in that: The sealing ring body (521) includes a plurality of arc-shaped pieces (5213), the axes of the plurality of arc-shaped pieces (5213) are arranged outward, and a deformation gap (5214) is left between two adjacent arc-shaped pieces (5213). Both ends of the arc-shaped pieces (5213) are provided with abutment portions (5215), and the two abutment portions (5215) respectively abut against the sealing ring (51) on the first inclined surface (622) and the second inclined surface (632). The third limiting ring (522) includes a plurality of limiting plugs (5222), and the number of the limiting plugs (5222) corresponds to the arrangement of the arc-shaped pieces (5213). The first limiting ring (62) is provided with a second pushing member (8) for driving the arc-shaped ring (321) plate to move toward the first limiting ring (62).

10. The submarine pipeline deflection connection structure according to claim 8 or 9, characterized in that: The sealing member (52) further comprises a fourth limiting ring (55) arranged on the inner peripheral wall of the sealing ring body (521).

Images