A step-by-step submarine pipeline connector

Abstract

The present invention relates to the field of submarine pipeline connection devices, and specifically to a step-by-step submarine pipeline connector, comprising a lower flange and a middle flange, wherein a sealing assembly is provided in the inner hole of the lower flange, a slip is provided in the inner hole of the middle flange, an adjusting screw is threadedly connected to the middle flange, the adjusting screw is provided with a compression sleeve pressed on the sealing assembly, the adjusting screw is used to drive the compression sleeve to push the sealing assembly to seal the pipeline, the middle flange is connected to the upper flange through a stud, the stud passes through the upper flange, and one end of the stud passes through the upper flange and is threadedly connected with a compression nut, a slip seat is provided at the end of the upper flange, and the compression nut is used to drive the slip seat to push the slip to clamp the pipeline. By setting the adjusting screw, the pipeline clamping and pipeline sealing are controlled respectively by the upper flange and the adjusting screw, so that the two processes of pipeline sealing and pipeline clamping are independent of each other and do not affect each other, thereby reducing the situation where leakage is easy to occur after pipeline repair due to unified control of the two processes, thereby reducing the repair effect of the pipeline.

Description

Technical Field

[0001] The present invention relates to the field of submarine pipeline connection devices, and in particular to a step-by-step submarine pipeline connector. Background Art

[0002] Subsea pipelines, as transportation equipment for offshore oil and gas production, are crucial for their safety and well-being. Compared to onshore pipelines, subsea pipelines carry greater operational risks and a higher probability of failure, primarily due to their harsh operating environments. A leak in a subsea pipeline can not only halt production at the offshore oil and gas field and contaminate the marine environment with crude oil, but also disrupt the normal production and livelihoods of the oil and gas suppliers. Furthermore, the low quality and operational complexity of underwater welding preclude the use of large vessels for pipe lifting and welding. Therefore, rapid repair and reconnection are crucial in the event of a subsea pipeline leak to minimize losses. To repair and reconnect the pipeline, the leaking section is cut and separated into two sections. Each section is then connected to a subsea pipeline connector, and the two connectors are then reconnected.

[0003] Existing submarine pipeline connectors typically include a flange, an end cap with an inner hole, and a clamping structure and a sealing structure disposed within the inner hole of the flange. The flange and the end cap are connected by bolts and nuts, and one end of the end cap typically extends into the inner hole of the flange. When connecting the pipeline to the submarine pipeline connector, the pipeline to be repaired is first inserted into the inner hole of the flange through the inner hole of the end cap. Then, by tightening the nut, one end of the end cap applies pressure to the clamping structure and the sealing structure, causing the sealing structure to deform and the clamping structure to produce radial displacement, thereby sealing and clamping the pipeline to be repaired. The clamping process and the sealing process of the pipeline are both triggered by the movement of the end cap, and the two processes are uniformly controlled. However, when the pipeline is repaired and connected, there are situations where the forces required to be applied to the clamping process and the sealing process of the pipeline are different. This results in one of the pipeline sealing or clamping processes proceeding normally, while the other process is subjected to excessive or insufficient force, which in turn leads to leakage after the pipeline is repaired, reducing the repair effect of the pipeline. Summary of the Invention

[0004] The technical solution adopted by the present invention to solve the technical problem is to provide a step-by-step submarine pipeline connector, comprising:

[0005] A lower flange and a middle flange, wherein the middle flange and the lower flange are connected to each other, and both the lower flange and the middle flange are sleeved on the pipeline;

[0006] A sealing assembly for sealing the pipeline is provided in the inner hole of the lower flange, a slip is provided in the inner hole of the middle flange, an adjusting screw is threadedly connected to the middle flange, a pressing sleeve is provided at the end of the adjusting screw, the pressing sleeve is pressed on the sealing assembly, and the adjusting screw is used to drive the pressing sleeve to push the sealing assembly to seal the pipeline. The middle flange is connected to the upper flange through a stud, one end of the stud passes through the upper flange, and one end of the stud passes through the upper flange and is threadedly connected to a clamping nut, a slip seat corresponding to the slip is provided at the end of the upper flange, and the clamping nut is used to drive the slip seat to push the slip to hold the pipeline tightly.

[0007] Furthermore, the inner hole of the lower flange includes a first cavity and a second cavity, the aperture of the first cavity is larger than the aperture of the second cavity, and step one and step two are formed at the junction of the first cavity and the second cavity.

[0008] Furthermore, the sealing assembly includes a sealing limiter, a first pressure ring, a second pressure ring and two sealing rings. The first pressure ring and the second pressure ring, as well as the two sealing rings, are all located between step one and step two. The first pressure ring and the second pressure ring are symmetrically arranged with respect to the plane where the diameter of the inner hole of the lower flange is located. The two sealing rings are respectively located on step one and step two. The sealing limiter is used to push the first pressure ring and the second pressure ring to press the two sealing rings to deform.

[0009] Furthermore, the first pressure ring and the second pressure ring are both provided with a limiting toothed ring corresponding to the sealing ring, and the diameter of the limiting toothed ring is larger than the diameter of the sealing ring.

[0010] Furthermore, the sealing limit member includes a first push member and a second push member, the outer periphery of the first pressure ring and the outer periphery of the second pressure ring are both provided with an outer conical surface, the outer conical surface on the first pressure ring and the outer conical surface on the second pressure ring cooperate to form a V-shaped groove, the first push member is provided with a V-shaped block adapted to the V-shaped groove, and the second push member is used to push the first push member to slide in the direction close to the center axis of the lower flange, thereby pushing the first pressure ring and the second pressure ring to squeeze the sealing ring respectively and cause the sealing ring to deform.

[0011] Furthermore, the second pushing member includes a positioning ring and a plurality of push blocks connected to the positioning ring, and the push blocks and the first pushing member are both distributed circumferentially about the central axis of the lower flange. The push blocks and the first pushing members correspond one to one, and the first pushing member is closer to the central axis of the inner hole of the lower flange than the corresponding push block, and the push block pushes the corresponding first pushing member to slide in the direction close to the central axis of the lower flange.

[0012] Furthermore, the push block is provided with a first inclined surface, the end of the first inclined surface away from the upper flange is farther away from the center axis of the lower flange than the end of the first inclined surface close to the upper flange, and the outer periphery of the first pushing member is provided with a second inclined surface adapted to the first inclined surface.

[0013] Furthermore, the lower flange is provided with an annular groove concentrically arranged with the first cavity, the radius of the annular groove is larger than the radius of the first cavity, and a plurality of sliding grooves are provided between the annular groove and the first cavity, and the sliding groove is used to connect the annular groove and the first cavity, and the push block is slidably arranged in the annular groove, and the first pushing member corresponds to the sliding groove, and the first pushing member is slidably arranged in the corresponding sliding groove, and the push block pushes the corresponding first pushing member to slide along the sliding groove in the direction close to the central axis of the lower flange.

[0014] Furthermore, a support ring is provided between the middle flange and the lower flange, a cavity is formed between the support ring and the middle flange and the lower flange, and the compression sleeve is slidably provided in the cavity.

[0015] Furthermore, the slip seat is provided with a clamping groove, and the upper flange is provided with a clamping ring corresponding to the clamping groove, and the clamping ring is clamped in the clamping groove.

[0016] The beneficial effect of the present invention is that: by setting the adjusting screw, the pipeline clamping and pipeline sealing are controlled respectively by the upper flange and the adjusting screw, so that the two processes of pipeline sealing and pipeline clamping are independent of each other and do not affect each other, thereby reducing the risk of leakage after pipeline repair due to unified control of the two processes, thereby reducing the repair effect of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] In the picture: Figure 1 This is an overall structural diagram of a step-by-step submarine pipeline connector provided by the present invention;

[0019] Figure 2 for Figure 1 A top view of the step-by-step submarine pipeline connector is shown;

[0020] Figure 3 for Figure 2 AA section view;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 for Figure 3 Enlarged view of point B in the middle;

[0023] Figure 6 for Figure 3 A perspective cross-sectional view of the structure shown;

[0024] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0025] Figure 8 for Figure 6 Enlarged view of point D in the middle;

[0026] Figure 9 for Figure 3 An exploded view of the structure of the portion shown;

[0027] Figure 10 for Figure 9 An exploded view of the sealing stop shown;

[0028] Figure 11 for Figure 9 An exploded view of a portion of the sealing assembly is shown;

[0029] Figure 12 for Figure 3 An exploded view of the structure of the portion shown;

[0030] Figure 13 This is a cross-sectional view of two pipes connected according to an embodiment of the present invention.

[0031] Explanation of reference numerals: 100, step-by-step submarine pipeline connector; 10, lower flange; 11, first cavity; 12, second cavity; 121, protrusion; 13, step one; 14, step two; 15, annular groove; 16, sliding groove; 17, second pressure test hole; 171, screw plug; 20, middle flange; 21, adjusting screw; 22, pressing sleeve; 221, small head flange; 222, large head flange; 23, pin; 24, mounting hole; 25, slip; 251, through groove; 252, slip tooth; 253, second cone; 26, holding cavity; 30, upper flange; 31, pressing nut; 32, slip seat; 321, first A conical surface; 322, a retaining ring; 33, a retaining groove; 34, an inner conical surface; 35, a lifting ring; 40, a stud; 50, a sealing assembly; 51, a sealing limiter; 511, a first pusher; 5111, a V-shaped block; 5112, a second inclined surface; 512, a second pusher; 5121, a positioning ring; 5122, a push block; 5123, a first inclined surface; 52, a first pressure ring; 521, a limiting tooth ring; 522, an outer conical surface; 53, a second pressure ring; 54, a sealing ring; 60, a support ring; 61, a cavity; 70, a spacer ring; 71, a first pressure test hole; 72, a ring groove; 80, a gasket; 200, a pipe; 201, a flange. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is now described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic principles of the present invention in an illustrative manner, and therefore only shows the structures related to the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Please refer to Figure 1 The present invention provides a step-by-step submarine pipeline connector 100, including a lower flange 10 and a middle flange 20. The middle flange 20 and the lower flange 10 are connected to each other, and the middle flange 20 is connected to the upper flange 30 through studs 40. The middle flange 20 is located between the upper flange 30 and the lower flange 10. The lower flange 10, the middle flange 20, and the upper flange 30 are all sleeved on the pipeline 200.

[0034] Please refer to Figure 3 A sealing assembly 50 for sealing the pipeline 200 is provided in the inner hole of the lower flange 10. The sealing assembly 50 includes a sealing limiter 51, a first pressure ring 52, a second pressure ring 53 and two sealing rings 54. The middle flange 20 is threadedly connected to an adjusting screw 21. A pressing sleeve 22 is provided at the end of the adjusting screw 21. The pressing sleeve 22 is pressed on the sealing limiter 51. The first pressure ring 52 and the second pressure ring 53 are respectively pressed on the two sealing rings 54. The adjusting screw 21 is used to drive the pressing sleeve 22 to push the sealing limiter 51, and then push the first pressure ring 52 and the second pressure ring 53 to squeeze the two sealing rings 54 respectively, so that the two sealing rings 54 are deformed to seal the pipeline 200.

[0035] For details, please refer to Figure 2 The top end of the adjusting screw 21 is mounted on the upper flange 30 , the adjusting screw 21 and the stud 40 are staggered, and the adjusting screw 21 and the stud 40 are distributed circumferentially about the central axis of the upper flange 30 .

[0036] Please refer to Figure 3 Since the top end of the adjusting screw 21 is mounted on the upper flange 30, the adjusting screw 21 needs to pass through the middle flange 20 and then push the pressing sleeve 22 to move when driving the pressing sleeve 22. The adjusting screw 21 needs to move a long distance, but in actual circumstances, the length of the adjusting screw 21 is limited. Therefore, a pin 23 is provided between the adjusting screw 21 and the pressing sleeve 22, and the middle flange 20 is provided with a mounting hole 24 for mounting the pin 23. The end of the adjusting screw 21 is threadedly connected to the mounting hole 24 and pressed on the pin 23. The provision of the pin 23 facilitates the adjusting screw 21 to apply pressure to the pressing sleeve 22, and the pin 23 can absorb part of the energy, thereby reducing the impact of shock and vibration on the pressing sleeve 22 and extending the service life of the equipment.

[0037] Please refer to Figure 3 and Figure 9 To correspond to the position of the adjusting screw 21, the compression sleeve 22 includes a small end flange 221 and a large end flange 222. The outer diameter of the large end flange 222 is larger than that of the small end flange 221. The large end flange 222 is located between the middle flange 20 and the lower flange 10. The end of the pin 23 is pressed against the end surface of the large end flange 222, and the stud 40 is provided on the large end flange 222 to limit the compression sleeve 22 in the diameter direction of the lower flange 10. The small end flange 221 is pressed against the sealing limiter 51.

[0038] Specifically, a support ring 60 is provided between the middle flange 20 and the lower flange 10 , and a cavity 61 for the large-head flange 222 to slide is formed between the support ring 60 and the middle flange 20 and the lower flange 10 .

[0039] For details, please refer to Figure 5 and Figure 7 The inner hole of the lower flange 10 includes a first cavity 11 and a second cavity 12. The aperture of the first cavity 11 is larger than that of the second cavity 12. Step 13 and step 2 14 are formed at the junction of the first cavity 11 and the second cavity 12. The first pressure ring 52, the second pressure ring 53, and the two sealing rings 54 are all located between step 13 and step 2 14. The first pressure ring 52 and the second pressure ring 53 are symmetrically arranged with respect to the plane where the diameter of the inner hole of the lower flange 10 is located. The two sealing rings 54 are respectively located on step 13 and step 2 14. The sealing limiter 51 is used to push the first pressure ring 52 and the second pressure ring 53 to compress the two sealing rings 54 to deform. Specifically, step 13 is closer to the middle flange 20 than step 2 14.

[0040] Please refer to Figure 11 To prevent excessive deformation of the sealing ring 54, the first pressure ring 52 and the second pressure ring 53 are both provided with a limiting toothed ring 521 corresponding to the sealing ring 54. The diameter of the limiting toothed ring 521 is slightly larger than the diameter of the sealing ring 54. The limiting toothed ring 521 limits the outer circumference of the sealing ring 54, thereby reducing excessive deformation of the sealing ring 54. Specifically, the limiting toothed ring 521 on the first pressure ring 52 and the first pressure ring 52, and the limiting toothed ring 521 and the second pressure ring 53 on the second pressure ring 53 are all integrally formed, and the first pressure ring 52, the second pressure ring 53, and the limiting toothed ring 521 are all made of metal.

[0041] Please refer to Figure 5 、 Figure 6 and Figure 7The lower flange 10 is provided with an annular groove 15 concentrically arranged with the first cavity 11. The radius of the annular groove 15 is larger than the radius of the first cavity 11. A sliding groove 16 is provided between the annular groove 15 and the first cavity 11. The sliding groove 16 is used to connect the annular groove 15 and the first cavity 11. The sealing limit member 51 includes a first push member 511 and a second push member 512. The outer periphery of the first pressure ring 52 and the outer periphery of the second pressure ring 53 are both provided with an outer conical surface 522. The outer conical surface 522 on the first pressure ring 52 and the outer conical surface 522 on the second pressure ring 53 cooperate to form a V-shaped groove. The first push member 511 is provided with a V-shaped block 5111 adapted to the V-shaped groove. The second push member 512 is penetrated into the annular groove 15 and is used to push the first push member 511 to slide along the sliding groove 16 in the direction close to the central axis of the lower flange 10, thereby pushing the first pressure ring 52 and the second pressure ring 53 to squeeze the sealing ring 54 respectively and cause the sealing ring 54 to deform.

[0042] In the prior art, two sealing rings 54 are typically provided to improve the sealing effect on the pipe 200. However, when the sealing rings 54 in the prior art are deformed, a pushing structure is typically used to push one sealing ring 54 to deform, thereby driving the deformation of the other sealing ring 54. The pushing structure is located on one side of one of the sealing rings 54 in the direction of the central axis of the pipe 200. This results in different forces acting on the two sealing rings 54, and different deformations of the two sealing rings 54, resulting in a poorer sealing effect for the sealing ring 54 away from the pushing structure, affecting the overall sealing effect of the two sealing rings 54. In the present application, by cooperating with the V-groove and the V-block 5111, the first pushing member 511 pushes the first pressure ring 52 and the second pressure ring 53 to squeeze the two sealing rings 54, respectively, so that the two sealing rings 54 are subjected to the same pressure, thereby causing the two sealing rings 54 to deform in the same manner and achieve the same sealing effect, thereby improving the overall sealing effect of the two sealing rings 54.

[0043] Please refer to Figure 5 and Figure 10Because both the first pressing ring 52 and the second pressing ring 53 are annular structures, the direction in which the first pushing member 511 applies force to the V-shaped groove needs to be along the diameter of the first pressing ring 52. Therefore, multiple first pushing members 511 are provided around the central axis of the lower flange 10. The second pushing member 512 includes a positioning ring 5121 and multiple pushing blocks 5122 connected to the positioning ring 5121. The positioning ring 5121 is used to connect the multiple pushing blocks 5122. The end of the small head flange 221 is pressed against the positioning ring 5121. Correspondingly, there are multiple push blocks 5122 and sliding grooves 16 distributed around the central axis of the lower flange 10. The push blocks 5122 correspond to the first push members 511, and the first push members 511 are closer to the central axis of the inner hole of the lower flange 10 than the corresponding push blocks 5122. The first push members 511 correspond to the sliding grooves 16. The push blocks 5122 are slidably arranged in the annular grooves 15, and the first push members 511 are slidably arranged in the corresponding sliding grooves 16. The push blocks 5122 push the corresponding first push members 511 to slide along the sliding grooves 16 in the direction close to the central axis of the lower flange 10.

[0044] Please refer to Figure 4 、 Figure 6 and Figure 8 The push block 5122 is provided with a first inclined surface 5123. The end of the first inclined surface 5123 away from the upper flange 30 is farther away from the central axis of the lower flange 10 than the end of the first inclined surface 5123 closer to the upper flange 30. The outer periphery of the first push member 511 is provided with a second inclined surface 5112 that matches the first inclined surface 5123. Due to the cooperation between the first inclined surface 5123 and the second inclined surface 5112, when the pressing sleeve 22 pushes the positioning ring 5121 to move the push block 5122 along the central axis of the lower flange 10, the first push member 511 moves toward the central axis of the lower flange 10, thereby pushing the first pressure ring 52 and the second pressure ring 53 away from each other along the central axis of the lower flange 10. At the same time, since there are multiple push blocks 5122 and first push members 511 distributed around the central axis of the lower flange 10, when multiple push blocks 5122 simultaneously push multiple first push members 511 to move closer to the central axis of the lower flange 10, the multiple first push members 511 also have a certain centering effect on the sealing ring 54 and the pipeline 200.

[0045] Please refer to Figure 3 and Figure 6In order to test the sealing performance of the sealing ring 54 after deformation, a spacer ring 70 is further provided between the sealing ring 54 and the second step 14 at the position closest to the fracture of the pipe 200. The spacer ring 70 is provided with a first pressure test hole 71, and the lower flange 10 is provided with a second pressure test hole 17 corresponding to and connected to the first pressure test hole 71. Ring grooves 72 are provided on the outer periphery and inner wall of the spacer ring 70, and the two ring grooves 72 are interconnected through the first pressure test hole 71. When not testing, the second pressure test hole 17 is sealed with a screw plug 171. When testing, the screw plug 171 is removed, and the sealing performance of the sealing ring 54 is tested through the second pressure test hole 17 and the first pressure test hole 71. If the tested pressure is stable and there is no leakage, the sealing ring 54 has achieved its sealing function and the medium inside the pipe 200 will not leak.

[0046] In order to further support the sealing ring 54 , a gasket 80 is provided between the spacer ring 70 and the second step 14 .

[0047] Please refer to Figure 3 、 Figure 4 and Figure 12 The inner bore of the middle flange 20 is provided with slips 25 for gripping the pipe 200. Specifically, the inner bore of the middle flange 20 is provided with a gripping cavity 26 for receiving the slips 25 and a slip seat 32. The slips 25 are provided with a plurality of through slots 251 extending along the central axis of the middle flange 20. The slots 251 facilitate tightening the slips 25 toward the central axis of the pipe 200. To better grip the pipe 200, the slips 25 are provided with sawtooth-shaped slip teeth 252 on the side near the central axis of the middle flange 20. When gripping the pipe 200, the slip teeth 252 and the outer circumference of the pipe 200 form an interference fit. One end of the stud 40 passes through the upper flange 30, and one end of the stud 40 is threadedly connected to a compression nut 31. The end of the upper flange 30 is provided with a slip seat 32 corresponding to the slips 25. The upper flange 30 is used to drive the slip seat 32 to push the slips 25 to grip the pipe 200.

[0048] Please refer to Figure 4 The cava 25 is closer to the central axis of the middle flange 20 than the cava seat 32. A first conical surface 321 is provided on the side of the cava seat 32 close to the central axis of the middle flange 20. A second conical surface 253 is provided on the side of the cava 25 away from the central axis of the middle flange 20. The end of the first conical surface 321 close to the upper flange 30 is closer to the central axis of the middle flange 20 than the end of the first conical surface 321 away from the upper flange 30, and the second conical surface 253 is adapted to the first conical surface 321.

[0049] When the pipeline 200 is clamped, the first conical surface 321 and the second conical surface 253 cooperate with each other to push the cava seat 32 to move, so that the cava 25 can be displaced in the radial direction of the middle flange 20, and the cava seat 32 is farther away from the center axis of the middle flange 20 than the cava 25, so that when the cava seat 32 moves away from the upper flange 30, the cava 25 moves toward the center axis of the middle flange 20, thereby achieving the clamping of the pipeline 200.

[0050] Please refer to Figure 3 To facilitate the upper flange 30 pushing the slip seat 32, the slip seat 32 is provided with a snap ring 322. The upper flange 30 is provided with a snap groove 33 corresponding to the snap ring 322, and the snap ring 322 is locked in the snap groove 33. The snap groove 33 and the snap ring 322 cooperate with each other to ensure that the upper flange 30 and the slip seat 32 are aligned with each other. Specifically, the snap groove 33 is annular and has a stepped cross-section, and the cross-section of the snap ring 322 is compatible with the snap groove 33.

[0051] Please refer to Figure 3 The inner opening of the upper flange 30 is provided with an inner conical surface 34. The end of the inner conical surface 34 closer to the middle flange 20 is closer to the central axis of the upper flange 30 than the end of the inner conical surface 34 farther from the middle flange 20. The inner conical surface 34 can guide the pipe 200 when the broken end of the pipe 200 is placed along the inner opening of the upper flange 30, thereby facilitating the centering of the pipe 200.

[0052] Please refer to Figure 3 A protrusion 121 is provided at the end of the second cavity 12 away from the middle flange 20, so that the aperture of the end of the second cavity 12 away from the middle flange 20 becomes smaller and the aperture of the end of the second cavity 12 away from the middle flange 20 is smaller than the inner diameter of the pipe 200, so that when the pipe 200 is inserted into the inner hole of the lower flange 10, the fracture of the pipe 200 is located on the protrusion 121, and the protrusion 121 supports the pipe 200.

[0053] Please refer to Figure 1 Specifically, the outer periphery of the upper flange 30 and the outer periphery of the lower flange 10 are connected with a plurality of lifting rings 35. The setting of the lifting rings 35 can facilitate the maintenance vessel to lift the entire step-by-step submarine pipeline connector 100 through the lifting rings 35 during installation.

[0054] Please refer to Figure 13During installation, the leaking portion of pipe 200 is first cut into two sections, and the cut ends of pipe 200 are then polished. A repair vessel is then used to lift the four lifting rings 35 of the two step-by-step submarine pipeline connectors 100, and the cut ends of pipe 200 are slowly lowered into the corresponding step-by-step submarine pipeline connectors 100. Finally, the two step-by-step submarine pipeline connectors 100 are connected via flange 201, achieving a rapid repair connection of pipe 200.

[0055] When connecting the pipeline 200 to the step-by-step submarine pipeline connector 100, the pipeline 200 is aligned with the inner conical surface 34 of the upper flange 30, and the step-by-step submarine pipeline connector 100 is slowly moved until the fracture of the pipeline 200 enters the inner hole of the lower flange 10. The adjusting screw 21 is then tightened with a torque tool. The adjusting screw 21 generates an axial force to squeeze the pin 23. The pin 23 then squeezes the large-head flange 222, causing the small-head flange 221 to squeeze the positioning ring 5121. The positioning ring 5121 drives multiple push blocks 5122 to slide along the annular groove 15. The push blocks 5122 push the corresponding first pusher 511 to slide toward the central axis of the lower flange 10, thereby pushing the first and second pressure rings 52 and 53 to squeeze the two sealing rings 54 respectively, causing the two sealing rings 54 to deform and achieve sealing of the pipeline 200. Then, tighten the compression nut 31 with a torque tool. The compression nut 31 generates an axial force to squeeze the upper flange 30, which in turn pushes the slip seat 32. The axial force generated by the slip seat 32 generates a radial force through the cooperation of the first conical surface 321 and the second conical surface 253, causing the slip 25 to radially displace, causing the slip teeth 252 on the slip 25 to bite into the outer circumference of the pipeline 200, thereby enabling the step-by-step submarine pipeline connector 100 to stably hold the pipeline 200. Then, remove the screw plug 171, input pressure to perform a back pressure test on the gap between the two sealing rings 54 of the spacer ring 70. If the pressure is stable and there is no leakage, the sealing ring 54 has achieved its sealing function, and the medium inside the pipeline 200 will not leak.

[0056] The step-by-step submarine pipeline connector 100 described in the present application controls the tightening and sealing of the pipeline 200 by means of the compression nut 31 and the adjustment screw 21, respectively, so that the two processes of sealing the pipeline 200 and tightening the pipeline 200 are independent of each other and do not affect each other, thereby reducing the risk of leakage after repair of the pipeline 200 due to unified control of the two processes, thereby reducing the repair effect of the pipeline 200.

[0057] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A step-by-step submarine pipeline connector, comprising a lower flange (10) and a middle flange (20), wherein the middle flange (20) and the lower flange (10) are connected to each other, and the lower flange (10) and the middle flange (20) are both sleeved on a pipeline (200), characterized in that: The inner hole of the lower flange (10) is provided with a sealing assembly (50) for sealing the pipeline (200), the inner hole of the middle flange (20) is provided with a slip (25), the middle flange (20) is threadedly connected with an adjusting screw (21), the end of the adjusting screw (21) is provided with a pressing sleeve (22), the pressing sleeve (22) is pressed on the sealing assembly (50), the adjusting screw (21) is used to drive the pressing sleeve (22) to push the sealing assembly (50) to seal the pipeline (200), the middle flange (20) is connected to the upper flange (30) through a stud (40), one end of the stud (40) passes through the upper flange (30), and the stud ( 40) is threadedly connected to a clamping nut (31) through one end of the upper flange (30), and a slip seat (32) corresponding to the slip (25) is provided at the end of the upper flange (30), and the clamping nut (31) is used to drive the slip seat (32) to push the slip (25) to hold the pipe (200), and the inner hole of the lower flange (10) includes a first cavity (11) and a second cavity (12), the aperture of the first cavity (11) is larger than the aperture of the second cavity (12), and the junction of the first cavity (11) and the second cavity (12) forms a step 1 (13) and a step 2 (14), and the sealing assembly (50) includes a sealing limiter (51) , a first pressure ring (52), a second pressure ring (53) and two sealing rings (54), the first pressure ring (52) and the second pressure ring (53) are both located between step one (13) and step two (14), the first pressure ring (52) and the second pressure ring (53) are symmetrically arranged with respect to the plane where the diameter of the inner hole of the lower flange (10) is located, the two sealing rings (54) are respectively located on step one (13) and step two (14), the sealing limiter (51) is used to push the first pressure ring (52) and the second pressure ring (53) to respectively press the two sealing rings (54) to deform, the sealing limiter (51) includes a first pusher (511) and a second pusher (512). Two pushing members (512), the outer periphery of the first pressure ring (52) and the outer periphery of the second pressure ring (53) are both provided with an outer conical surface (522), the outer conical surface (522) on the first pressure ring (52) and the outer conical surface (522) on the second pressure ring (53) cooperate to form a V-shaped groove, the first pushing member (511) is provided with a V-shaped block (5111) adapted to the V-shaped groove, the second pushing member (512) is used to push the first pushing member (511) to slide in the direction close to the central axis of the lower flange (10), and then push the first pressure ring (52) and the second pressure ring (53) to squeeze the sealing ring (54) respectively and cause the sealing ring (54) to deform.

2. The step-by-step submarine pipeline connector according to claim 1, characterized in that: The first pressure ring (52) and the second pressure ring (53) are both provided with a limiting toothed ring (521) corresponding to the sealing ring (54), and the diameter of the limiting toothed ring (521) is larger than the diameter of the sealing ring (54).

3. The step-by-step submarine pipeline connector according to claim 2, characterized in that: The second pushing member (512) includes a positioning ring (5121) and a plurality of pushing blocks (5122) connected to the positioning ring (5121), and the pushing blocks (5122) and the first pushing member (511) are both distributed in a plurality about the central axis of the lower flange (10), and the pushing blocks (5122) and the first pushing member (511) correspond one to one, and the first pushing member (511) is closer to the central axis of the inner hole of the lower flange (10) than the corresponding pushing block (5122), and the pushing block (5122) pushes the corresponding first pushing member (511) to slide in a direction close to the central axis of the lower flange (10).

4. The step-by-step submarine pipeline connector according to claim 3, characterized in that: The push block (5122) is provided with a first inclined surface (5123), and the end of the first inclined surface (5123) away from the upper flange (30) is farther away from the center axis of the lower flange (10) than the end of the first inclined surface (5123) close to the upper flange (30), and the outer periphery of the first pushing member (511) is provided with a second inclined surface (5112) adapted to the first inclined surface (5123).

5. The step-by-step submarine pipeline connector according to claim 4, characterized in that: The lower flange (10) is provided with an annular groove (15) concentrically arranged with the first cavity (11), the radius of the annular groove (15) is greater than the radius of the first cavity (11), a plurality of sliding grooves (16) are provided between the annular groove (15) and the first cavity (11), the sliding grooves (16) are used to connect the annular groove (15) and the first cavity (11), the pushing block (5122) is slidably arranged in the annular groove (15), the first pushing member (511) corresponds to the sliding groove (16), and the first pushing member (511) is slidably arranged in the corresponding sliding groove (16), and the pushing block (5122 pushes the corresponding first pushing member (511) to slide along the sliding groove (16) in a direction close to the central axis of the lower flange (10).

6. The step-by-step submarine pipeline connector according to claim 1, characterized in that: A support ring (60) is provided between the middle flange (20) and the lower flange (10), a cavity (61) is formed between the support ring (60) and the middle flange (20) and the lower flange (10), and the pressing sleeve (22) is slidably provided in the cavity (61).

7. The step-by-step submarine pipeline connector according to claim 1, characterized in that: The slip seat (32) is provided with a clamping groove (33), and the upper flange (30) is provided with a clamping ring (322) corresponding to the clamping groove (33), and the clamping ring (322) is clamped in the clamping groove (33).

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