Step-by-step type submarine pipeline connector

Abstract

The invention relates to the field of submarine pipeline connecting devices, in particular to a step-by-step type submarine pipeline connector which comprises a lower flange and a middle flange, a sealing assembly is arranged in an inner hole of the lower flange, a slip is arranged in an inner hole of the middle flange, the middle flange is in threaded connection with an adjusting screw, and the adjusting screw is provided with a pressing sleeve pressed on the sealing assembly. The adjusting screw is used for driving the pressing sleeve to push the sealing assembly to seal the pipeline, the middle flange is connected with an upper flange through a stud, the stud penetrates through the upper flange, the end, penetrating through the upper flange, of the stud is in threaded connection with a compression nut, a slip bowl is arranged at the end of the upper flange, and the compression nut is used for driving the slip bowl to push the slip to tightly hold the pipeline. Through the arrangement of the adjusting screw, the upper flange and the adjusting screw are used for controlling pipeline holding and pipeline sealing respectively, so that the pipeline sealing process and the pipeline holding process are mutually independent and do not influence each other, and the situation that the pipeline repairing effect is reduced due to the fact that leakage is likely to occur after pipeline repairing caused by unified control of the two processes is reduced.

Description

Technical Field

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

[0002] As a conveying device for offshore oil and gas exploitation, the safety of subsea oil pipelines is an important issue related to the normal operation of the offshore oil exploitation system. Compared with onshore pipelines, subsea pipelines have greater operation risks and higher failure probabilities, which are mainly closely related to their harsh working environmental conditions. Once a subsea oil pipeline leaks, it will not only cause the shutdown of offshore oil and gas fields and the pollution of the marine environment by crude oil, but also affect the normal production and life of the oil and gas suppliers. At the same time, due to the low quality of underwater welding and the great difficulty of the operation, it is necessary to avoid using large ships for pipe lifting and welding. Therefore, when a subsea oil pipeline leaks, it is necessary to achieve rapid repair and connection to minimize the losses caused by the pipeline leak. When repairing and connecting the pipeline, the leaking pipeline is cut off and separated into two sections of pipelines, and then the two sections of pipelines are respectively connected to a subsea pipeline connector, and then the two subsea pipeline connectors are connected to each other.

[0003] Existing subsea pipeline connectors generally include flanges, end caps with inner holes, and a clamping structure and a sealing structure arranged in the inner holes of the flanges. The flanges and the end caps are connected by bolts and nuts, and one end of the end cap usually extends into the inner hole of the flange. When connecting the pipeline and the subsea pipeline connector, first insert the pipeline to be repaired into the inner hole of the flange through the inner hole of the end cap, and then tighten the nuts, so that 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 generate a radial displacement, so as to achieve the sealing and clamping of the pipeline to be repaired. Among them, 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 controlled uniformly. However, when repairing and connecting the pipeline, there are different situations where the forces required for the clamping process and the sealing process of the pipeline are different, which results in one of the pipeline sealing or pipeline clamping processes proceeding normally, while the other process is under too much or too little force, and thus it is easy to leak 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 its technical problems is: to provide a step-by-step subsea pipeline connector, including: A lower flange and a middle flange, 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; A sealing assembly for sealing the pipeline is provided inside the inner hole of the lower flange. A slip is provided inside the inner hole of the middle flange. The middle flange is threadedly connected with an adjusting screw, and a pressing sleeve is provided at the end of the adjusting screw. The pressing sleeve presses on the sealing assembly. The adjusting screw is used to drive the pressing sleeve to push the sealing assembly to seal the pipeline. The middle flange is connected with an upper flange through a stud. One end of the stud passes through the upper flange, and a compression nut is threadedly connected to the end of the stud that passes through the upper flange. A slip seat corresponding to the slip is provided at the end of the upper flange. The compression nut is used to drive the slip seat to push the slip to hold the pipeline tightly.

[0005] Further, the inner hole of the lower flange includes a first cavity and a second cavity. The aperture of the first cavity is larger than that of the second cavity. A first step and a second step are formed at the junction of the first cavity and the second cavity.

[0006] Further, the sealing assembly includes a sealing limit member, a first pressing ring, a second pressing ring, and two sealing rings. The first pressing ring, the second pressing ring, and the two sealing rings are all located between the first step and the second step. The first pressing ring and the second pressing 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 the first step and the second step. The sealing limit member is used to push the first pressing ring and the second pressing ring to respectively press the two sealing rings to deform.

[0007] Further, the first pressing ring and the second pressing ring are both provided with limit tooth rings corresponding to the sealing rings. The diameter of the limit tooth ring is larger than that of the sealing ring.

[0008] Further, the sealing limit member includes a first pushing member and a second pushing member. Outer conical surfaces are provided on the outer peripheries of the first pressing ring and the second pressing ring. The outer conical surface on the first pressing ring and the outer conical surface on the second pressing ring cooperate to form a V-shaped groove. The first pushing member is provided with a V-shaped block adapted to the V-shaped groove. The second pushing member is used to push the first pushing member to slide in the direction close to the central axis of the lower flange, thereby pushing the first pressing ring and the second pressing ring to respectively squeeze the sealing rings and cause the sealing rings to deform.

[0009] Further, the second pushing member includes a positioning ring and a plurality of pushing blocks connected to the positioning ring. The pushing blocks and the first pushing member are both circumferentially distributed around the central axis of the lower flange. The pushing blocks and the first pushing member correspond one by one, and the first pushing member is closer to the central axis of the inner hole of the lower flange than the corresponding pushing block. The pushing block pushes the corresponding first pushing member to slide in the direction close to the central axis of the lower flange.

[0010] Further, the pushing block is provided with a first inclined surface. The end of the first inclined surface far from the upper flange is farther from the central axis of the lower flange than the end of the first inclined surface close to the upper flange. A second inclined surface adapted to the first inclined surface is provided on the outer periphery of the first pushing member.

[0011] Further, the lower flange is provided with an annular groove concentric with the first cavity. The radius of the annular groove is greater than the radius of the first cavity. A plurality of sliding grooves are provided between the annular groove and the first cavity. The sliding grooves are used to communicate the annular groove and the first cavity. The push block is slidably disposed in the annular groove. The first pusher is corresponding to the sliding groove, and the first pusher is slidably disposed in the corresponding sliding groove. The push block pushes the corresponding first pusher to slide along the sliding groove towards the direction close to the central axis of the lower flange.

[0012] Further, 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. The compression sleeve is slidably disposed in the cavity.

[0013] Further, the slip joint seat is provided with a clamping groove, and the upper flange is provided with a clamping ring corresponding to the clamping groove. The clamping ring is clamped in the clamping groove.

[0014] The beneficial effects of the present invention are as follows: Through the arrangement of the adjusting screw, the pipeline clamping and the pipeline sealing are respectively controlled 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, reducing the leakage that is likely to occur after the pipeline repair caused by the unified control of the two processes, and further reducing the repair effect of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below in conjunction with the drawings and embodiments.

[0016] In the figure: Figure 1 is the overall structure diagram of a step-by-step subsea pipeline connector provided by the present invention; Figure 2 is Figure 1 the top view of the step-by-step subsea pipeline connector shown; Figure 3 is Figure 2 the sectional view taken along the A-A direction of Figure 4 is Figure 3 the enlarged view at A in Figure 5 is Figure 3 the enlarged view at B in Figure 6 is Figure 3 the three-dimensional sectional view of the partial structure shown; Figure 7 is Figure 6 the enlarged view at C in Figure 8 is Figure 6 the enlarged view at D in Figure 9 is Figure 3Exploded view of the shown partial structure; Figure 10 is Figure 9 exploded view of the shown sealing and limiting member; Figure 11 is Figure 9 exploded view of the partial structure of the shown sealing assembly; Figure 12 is Figure 3 exploded view of the shown partial structure; Figure 13 is the cross-sectional view when two pipelines are connected in the embodiment of the present invention.

[0017] Explanation of reference numerals: 100, distributed subsea 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, plug; 20, middle flange; 21, adjusting screw; 22, pressing sleeve; 221, small head flange; 222, large head flange; 23, pin shaft; 24, mounting hole; 25, slip; 251, through slot; 252, slip teeth; 253, second conical surface; 26, holding cavity; 30, upper flange; 31, compression nut; 32, slip seat; 321, first conical surface; 322, snap ring; 33, card slot; 34, inner conical surface; 35, lifting ring; 40, stud; 50, sealing assembly; 51, sealing and limiting member; 511, first pusher; 5111, V-shaped block; 5112, second inclined surface; 512, second pusher; 5121, positioning ring; 5122, pushing block; 5123, first inclined surface; 52, first pressing ring; 521, limiting tooth ring; 522, outer conical surface; 53, second pressing ring; 54, sealing ring; 60, support ring; 61, cavity; 70, spacer ring; 71, first pressure test hole; 72, ring groove; 80, washer; 200, pipeline; 201, flange. Detailed implementation manners

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings. This figure is a simplified schematic diagram, only illustrating the basics of the present invention in a schematic way, so it only shows the components related to the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1The 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, the middle flange 20 is connected to an upper flange 30 through a stud 40, the middle flange 20 is located between the upper flange 30 and the lower flange 10, and the lower flange 10, the middle flange 20, and the upper flange 30 are all sleeved on the pipeline 200.

[0020] 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 with 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.

[0021] 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 .

[0022] Please refer to Figure 3 Since the top 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 the length of the adjusting screw 21 is limited in actual situations. Therefore, a pin 23 is arranged between the adjusting screw 21 and the pressing sleeve 22, and the middle flange 20 is provided with a mounting hole 24 for the pin 23 to be installed. The end of the adjusting screw 21 is threadedly connected with the mounting hole 24 and pressed on the pin 23. The arrangement 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 and vibration on the pressing sleeve 22 and extending the service life of the equipment.

[0023] Please refer to Figure 3 and Figure 9 In order to correspond to the position of the adjusting screw 21, the pressing sleeve 22 includes a small head flange 221 and a large head flange 222. The outer diameter of the large head flange 222 is larger than the outer diameter of the small head flange 221. The large head flange 222 is located between the middle flange 20 and the lower flange 10. The end of the pin 23 is pressed on the end surface of the large head flange 222, and the stud 40 is penetrated on the large head flange 222, so as to limit the pressing sleeve 22 in the diameter direction of the lower flange 10. The small head flange 221 is pressed on the sealing limiter 51.

[0024] 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, the middle flange 20, and the lower flange 10.

[0025] Specifically, 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. A first step 13 and a second step 14 are formed at the junction of the first cavity 11 and the second cavity 12. The first pressing ring 52, the second pressing ring 53, and the two sealing rings 54 are all located between the first step 13 and the second step 14. The first pressing ring 52 and the second pressing 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 the first step 13 and the second step 14. The sealing and limiting member 51 is used to push the first pressing ring 52 and the second pressing ring 53 to respectively press the two sealing rings 54 to deform. Specifically, the first step 13 is closer to the middle flange 20 than the second step 14.

[0026] Please refer to Figure 11 , in order to prevent the sealing ring 54 from deforming excessively, the first pressing ring 52 and the second pressing ring 53 are both provided with limiting tooth rings 521 corresponding to the sealing ring 54. The diameter of the limiting tooth ring 521 is slightly larger than the diameter of the sealing ring 54. The outer circumference of the sealing ring 54 is limited by the limiting tooth ring 521 to reduce the excessive deformation of the sealing ring 54. Specifically, the limiting tooth ring 521 on the first pressing ring 52 and the first pressing ring 52, and the limiting tooth ring 521 on the second pressing ring 53 and the second pressing ring 53 are integrally formed, and the first pressing ring 52, the second pressing ring 53, and the limiting tooth ring 521 are all made of metal material.

[0027] Please refer to Figure 5 , Figure 6 and Figure 7 , the lower flange 10 is provided with an annular groove 15 concentric 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 and limiting member 51 includes a first pushing member 511 and a second pushing member 512. Outer conical surfaces 522 are provided on the outer circumferences of the first pressing ring 52 and the second pressing ring 53. The outer conical surface 522 on the first pressing ring 52 and the outer conical surface 522 on the second pressing 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 inserted into the annular groove 15 and is used to push the first pushing 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 pressing ring 52 and the second pressing ring 53 to respectively squeeze the sealing ring 54 and cause the sealing ring 54 to deform.

[0028] In the prior art, usually two sealing rings 54 are provided to improve the sealing effect on the pipeline 200. However, when the sealing rings 54 in the prior art are deformed, usually a pushing structure is used to push one sealing ring 54 to deform, and then drive the other sealing ring 54 to deform. The pushing structure is located on one side of one of the sealing rings 54 in the central axis direction of the pipeline 200. This results in different force-bearing conditions of the two sealing rings 54 and different deformation conditions of the two sealing rings 54, thereby causing a poor sealing effect of the sealing ring 54 far from the pushing structure and affecting the overall sealing effect of the two sealing rings 54. In the present application, through the cooperation of the V-shaped groove and the V-shaped block 5111, the first pushing member 511 pushes the first pressing ring 52 and the second pressing ring 53 to respectively squeeze the two sealing rings 54, so that the two sealing rings 54 are subjected to the same pressure, and then the deformation conditions of the two sealing rings 54 are the same and the sealing effects are the same, thereby improving the overall sealing effect of the two sealing rings 54.

[0029] Please refer to Figure 5 and Figure 10 , since both the first pressing ring 52 and the second pressing ring 53 are annular structures, the force application direction of the first pushing member 511 on the V-shaped groove needs to be along the diameter direction of the first pressing ring 52. Therefore, a plurality of first pushing members 511 are arranged circumferentially about the central axis of the lower flange 10. The second pushing member 512 includes a positioning ring 5121 and a plurality of pushing blocks 5122 connected to the positioning ring 5121. The positioning ring 5121 is used to connect the plurality of pushing blocks 5122, and the end of the small-head flange 221 is pressed on the positioning ring 5121. Correspondingly, a plurality of pushing blocks 5122 and sliding grooves 16 are both distributed circumferentially about the central axis of the lower flange 10. The pushing blocks 5122 correspond to the first pushing members 511, and the first pushing members 511 are closer to the central axis of the inner hole of the lower flange 10 than the corresponding pushing blocks 5122. The first pushing members 511 correspond to the sliding grooves 16. The pushing blocks 5122 are slidably arranged in the annular groove 15, and the first pushing members 511 are slidably arranged in the corresponding sliding grooves 16. The pushing blocks 5122 push the corresponding first pushing members 511 to slide along the sliding grooves 16 in the direction close to the central axis of the lower flange 10.

[0030] Please refer to Figure 4 , Figure 6 and Figure 8, the pushing 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 from the central axis of the lower flange 10 than the end of the first inclined surface 5123 close to the upper flange 30. The outer periphery of the first pushing member 511 is provided with a second inclined surface 5112 adapted to the first inclined surface 5123. Through the cooperation of the first inclined surface 5123 and the second inclined surface 5112, when the pressing sleeve 22 pushes the positioning ring 5121 and the pushing block 5122 moves along the central axis direction of the lower flange 10, the first pushing member 511 moves toward the central axis direction of the lower flange 10, thereby pushing the first pressing ring 52 and the second pressing ring 53 to move away from each other along the central axis direction of the lower flange 10. At the same time, since both the pushing block 5122 and the first pushing member 511 are circumferentially distributed around the central axis of the lower flange 10 in multiple numbers, when multiple pushing blocks 5122 simultaneously push multiple first pushing members 511 to move toward the central axis of the lower flange 10, the multiple first pushing members 511 also have a certain centering effect on the sealing ring 54 and the pipeline 200.

[0031] Please refer to Figure 3 and Figure 6 , in order to detect the sealing performance of the sealing ring 54 after deformation, a spacer ring 70 is further provided between the sealing ring 54 closest to the fracture of the pipeline 200 and the second step 14. 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 communicating with the first pressure test hole 71. Both the outer periphery and the inner wall of the spacer ring 70 are provided with annular grooves 72, and the two annular grooves 72 are communicated with each other through the first pressure test hole 71. When not tested, it is blocked at the second pressure test hole 17 by a plug 171. When tested, the 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 does not leak, the sealing ring 54 achieves the sealing effect, and the medium inside the pipeline 200 will not leak.

[0032] In order to further support the sealing ring 54, a washer 80 is provided between the spacer ring 70 and the second step 14.

[0033] Please refer to Figure 3 , Figure 4 and Figure 12, the inner hole of the middle flange 20 is provided with a chuck 25 for clamping the pipeline 200. Specifically, the inner hole of the middle flange 20 is provided with a clamping cavity 26 for placing the chuck 25 and the chuck seat 32. The chuck 25 is provided with a plurality of through grooves 251 arranged along the central axis direction of the middle flange 20. The arrangement of the through grooves 251 can facilitate the chuck 25 to tighten towards the central axis of the pipeline 200. In order to better clamp the pipeline 200, a chuck tooth 252 is provided on the side of the chuck 25 close to the central axis of the middle flange 20. The chuck tooth 252 is serrated. When clamping the pipeline 200, the chuck tooth 252 and the outer circumference of the pipeline 200 are in interference fit. One end of the stud 40 passes through the upper flange 30, and a compression nut 31 is threadedly connected to the end of the stud 40 passing through the upper flange 30. A chuck seat 32 corresponding to the chuck 25 is provided at the end of the upper flange 30. The upper flange 30 is used to drive the chuck seat 32 to push the chuck 25 to clamp the pipeline 200.

[0034] Please refer to Figure 4 , the chuck 25 is closer to the central axis of the middle flange 20 than the chuck seat 32. A first conical surface 321 is provided on the side of the chuck seat 32 close to the central axis of the middle flange 20. A second conical surface 253 is provided on the side of the chuck 25 far from the central axis of the middle flange 20. One 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 far from the upper flange 30. The second conical surface 253 is adapted to the first conical surface 321.

[0035] When the pipeline 200 is clamped, by the mutual cooperation of the first conical surface 321 and the second conical surface 253, pushing the chuck seat 32 to move can make the chuck 25 generate a displacement in the radial direction of the middle flange 20. And the chuck seat 32 is farther from the central axis of the middle flange 20 than the chuck 25. When the chuck seat 32 moves away from the upper flange 30, the chuck 25 moves towards the central axis of the middle flange 20, so as to realize the clamping of the pipeline 200.

[0036] Please refer to Figure 3 , in order to facilitate the upper flange 30 to push the chuck seat 32, the chuck seat 32 is provided with a snap ring 322, and the upper flange 30 is provided with a slot 33 corresponding to the snap ring 322. The snap ring 322 is clamped in the slot 33. Through the mutual cooperation of the slot 33 and the snap ring 322, the upper flange 30 and the chuck seat 32 are aligned with each other. Specifically, the slot 33 is annularly arranged, and the cross section of the slot 33 is a stepped structure. The cross section of the snap ring 322 is adapted to the slot 33.

[0037] Please refer to Figure 3, an inner conical surface 34 is provided at the opening of the inner hole of the upper flange 30. One end of the inner conical surface 34 close 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 far from the middle flange 20. Through the setting of the inner conical surface 34, the inner conical surface 34 can guide the pipeline 200 when the fracture of the pipeline 200 is placed along the inner hole of the upper flange 30, facilitating the alignment of the pipeline 200.

[0038] Please refer to Figure 3 , a protrusion 121 is provided at one end of the second cavity 12 far from the middle flange 20, so that the aperture at one end of the second cavity 12 far from the middle flange 20 becomes smaller and the aperture at one end of the second cavity 12 far from the middle flange 20 is smaller than the inner diameter of the pipeline 200. So that when the pipeline 200 is inserted into the inner hole of the lower flange 10, the fracture of the pipeline 200 is located on the protrusion 121, and the protrusion 121 supports the pipeline 200.

[0039] Please refer to Figure 1 , specifically, a plurality of lifting rings 35 are connected to the outer peripheries of the upper flange 30 and the lower flange 10. The setting of the lifting rings 35 can facilitate the maintenance ship to lift the entire distributed subsea pipeline connector 100 through the lifting rings 35 during installation.

[0040] Please refer to Figure 13 , during installation, first cut the leakage part of the pipeline 200 into two separated sections of the pipeline 200, and then polish the fracture of the pipeline 200. Then, the maintenance ship lifts the 4 lifting rings 35 of the two distributed subsea pipeline connectors 100 respectively, and slowly puts the fracture of the pipeline 200 into the corresponding distributed subsea pipeline connector 100. Finally, the two distributed subsea pipeline connectors 100 are connected through the flange 201, and finally the rapid repair connection of the pipeline 200 is realized.

[0041] When connecting the pipeline 200 and the distributed subsea pipeline connector 100, the pipeline 200 is centered by the inner conical surface 34 of the upper flange 30, and then the distributed subsea pipeline connector 100 is slowly moved until the fracture of the pipeline 200 enters the inner hole of the lower flange 10. Then, the adjusting screw 21 is tightened by a torque tool. The adjusting screw 21 generates an axial force to squeeze the pin shaft 23, and then the pin shaft 23 squeezes the large head flange 222 so that the small head flange 221 squeezes the positioning ring 5121. The positioning ring 5121 drives a plurality of push blocks 5122 to slide along the annular groove 15. The push blocks 5122 push the corresponding first pushing member 511 to slide towards the central axis of the lower flange 10, thereby pushing the first pressing ring 52 and the second pressing ring 53 to squeeze the two sealing rings 54 respectively, causing the two sealing rings 54 to deform and realizing the sealing of the pipeline 200. Then, the compression nut 31 is tightened by a torque tool. The compression nut 31 generates an axial force to squeeze the upper flange 30, and the upper flange 30 then pushes the slip joint seat 32. The axial force generated by the slip joint seat 32 generates a radial force through the cooperation of the first conical surface 321 and the second conical surface 253 to cause the radial displacement of the slip joint 25, so that the slip joint teeth 252 on the slip joint 25 bite into the outer circumference of the pipeline 200, so that the distributed subsea pipeline connector 100 can stably hold the pipeline 200. Then, the plug 171 is removed, and the input pressure is used to perform a back pressure test on the gap between the spacer ring 70 and the two sealing rings 54. If the pressure is stable and there is no leakage, the sealing rings 54 achieve the sealing effect, and the medium inside the pipeline 200 will not leak.

[0042] In the present application, the distributed subsea pipeline connector 100 described controls the clamping of the pipeline 200 and the sealing of the pipeline 200 through the compression nut 31 and the adjusting screw 21 respectively, so that the two processes of the sealing of the pipeline 200 and the clamping of the pipeline 200 are independent of each other and do not affect each other, reducing the situation that the pipeline 200 is prone to leakage after repair due to the unified control of the two processes, and further reducing the repair effect of the pipeline 200.

[0043] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distributed subsea pipeline connector, comprising a lower flange (10) and a middle flange (20), the middle flange (20) and the lower flange (10) are connected to each other, and both the lower flange (10) and the middle flange (20) are sleeved on a pipeline (200), characterized in that: A sealing assembly (50) for sealing the pipeline (200) is provided inside the inner hole of the lower flange (10). A slip (25) is provided inside the inner hole of the middle flange (20). The middle flange (20) is threadedly connected with an adjusting screw (21). A pressure sleeve (22) is provided at the end of the adjusting screw (21). The pressure sleeve (22) presses on the sealing assembly (50). The adjusting screw (21) is used to drive the pressure sleeve (22) to push the sealing assembly (50) to seal the pipeline (200). The middle flange (20) is connected with an upper flange (30) through a stud (40). One end of the stud (40) passes through the upper flange (30), and a compression nut (31) is threadedly connected to the end of the stud (40) passing through the upper flange (30). A slip seat (32) corresponding to the slip (25) is provided at the end of the upper flange (30). The compression nut (31) is used to drive the slip seat (32) to push the slip (25) to hold the pipeline (200) tightly.

2. The step-by-step subsea pipeline connector according to claim 1, wherein: 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). A first step (13) and a second step (14) are formed at the junction of the first cavity (11) and the second cavity (12).

3. The step-by-step subsea pipeline connector according to claim 2, characterized in that: The sealing assembly (50) includes a sealing limit member (51), a first pressure ring (52), a second pressure ring (53), and two sealing rings (54). The first pressure ring (52), the second pressure ring (53), and the two sealing rings (54) are all located between the first step (13) and the second step (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 the first step (13) and the second step (14). The sealing limit member (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.

4. The step-by-step subsea pipeline connector according to claim 3, wherein: Both the first pressure ring (52) and the second pressure ring (53) are provided with a limit tooth ring (521) corresponding to the sealing ring (54). The diameter of the limit tooth ring (521) is larger than that of the sealing ring (54).

5. The step-by-step subsea pipeline connector according to claim 3, characterized in that: The sealing limit member (51) includes a first pushing member (511) and a second pushing member (512). Outer conical surfaces (522) are provided on the outer perimeters of both the first pressure ring (52) and the second pressure ring (53). 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), thereby pushing the first pressure ring (52) and the second pressure ring (53) to respectively squeeze the sealing ring (54) and cause the sealing ring (54) to deform.

6. The step-by-step subsea pipeline connector according to claim 5, characterized in that: The second pusher (512) includes a positioning ring (5121) and a plurality of push blocks (5122) connected to the positioning ring (5121). The push blocks (5122) and the first pusher (511) are both circumferentially distributed around the central axis of the lower flange (10) in multiple numbers. The push blocks (5122) and the first pusher (511) correspond to each other one by one, and the first pusher (511) is closer to the central axis of the inner hole of the lower flange (10) than the corresponding push block (5122). The push block (5122) pushes the corresponding first pusher (511) to slide in the direction close to the central axis of the lower flange (10).

7. The step-by-step subsea pipeline connector according to claim 6, characterized in that: The push block (5122) is provided with a first inclined surface (5123). The end of the first inclined surface (5123) far from the upper flange (30) is farther from the central axis of the lower flange (10) than the end of the first inclined surface (5123) close to the upper flange (30). The outer periphery of the first pusher (511) is provided with a second inclined surface (5112) adapted to the first inclined surface (5123).

8. The step-by-step subsea pipeline connector according to claim 6, characterized in that: The lower flange (10) is provided with an annular groove (15) concentric 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 communicate the annular groove (15) and the first cavity (11). The push block (5122) is slidably arranged in the annular groove (15). The first pusher (511) corresponds to the sliding groove (16), and the first pusher (511) is slidably arranged in the corresponding sliding groove (16). The push block (5122) pushes the corresponding first pusher (511) to slide along the sliding groove (16) in the direction close to the central axis of the lower flange (10).

9. The step-by-step subsea pipeline connector according to claim 1, wherein: 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), the middle flange (20) and the lower flange (10). The bushing (22) is slidably arranged in the cavity (61).

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

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