CN110608322A - Four-wire marine riser joint - Google Patents
Four-wire marine riser joint Download PDFInfo
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- CN110608322A CN110608322A CN201910856655.1A CN201910856655A CN110608322A CN 110608322 A CN110608322 A CN 110608322A CN 201910856655 A CN201910856655 A CN 201910856655A CN 110608322 A CN110608322 A CN 110608322A
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- thread
- joint
- female joint
- male connector
- female
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- 238000007789 sealing Methods 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 5
- 101100008044 Caenorhabditis elegans cut-1 gene Proteins 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 239000004519 grease Substances 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/001—Screw-threaded joints; Forms of screw-threads for such joints with conical threads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/04—Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/06—Screw-threaded joints; Forms of screw-threads for such joints characterised by the shape of the screw-thread
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L15/00—Screw-threaded joints; Forms of screw-threads for such joints
- F16L15/08—Screw-threaded joints; Forms of screw-threads for such joints with supplementary elements
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a four-line marine riser joint which comprises a male joint and a female joint, wherein the male joint comprises four uniformly distributed grooves which are adjacent to an outer conical thread, a small end face, a main shoulder and the main shoulder and are used for placing a locking block, and the female joint comprises an inner conical thread, a large end face, an auxiliary shoulder, a sealing groove and a stress relieving groove. The screw thread loading face adopts the burden bearing angle, and the screw thread guiding surface is formed by two line segment transitions, and outer cone screw thread and interior cone screw thread cooperation use all are that the tapering is 1:3, large taper thread; the tooth heights of the inner conical threads are equal, the tooth heights of the middle conical threads are equal, and the threads on the two sides are variable-tooth-height threads. The four-line marine riser joint has the advantages of high screwing speed, easiness in storing thread grease among joint threads, uniform thread stress and strong bearing capacity.
Description
Technical Field
The invention relates to a four-line marine riser joint.
Background
The marine riser that uses in the offshore oil development is mostly the segmental riser, and the riser is connected through the joint, and current riser joint main form comprises torque shoulder, sealing part and connecting thread triplex. Need great moment of torsion to overcome frictional force in the process function of detaining on the riser joint, in order to make things convenient for the knot of detaining, need store screw thread fat between the screw thread and reduce frictional force. The marine riser joint is connected through the screw thread, and no matter be single shoulder connection or double shoulder connection, the screw thread atress is all inhomogeneous, and the deep sea condition is complicated, and the riser easily receives alternating load's influence, has consequently had higher requirement to the bearing capacity of screw thread. The riser receives the influence of stormy waves, and the screw thread takes place to become flexible easily and the screw thread is difficult to the income knot to cause not enough and the difficult thread damage that the make-up leads to of screw thread of leakproofness and joint strength. The traditional marine riser has the problems of low screwing speed, difficulty in storing thread grease between joint threads, uneven stress of thread teeth, weak bearing capacity and the like.
Disclosure of Invention
The invention aims to overcome the defects and provide the four-line marine riser joint which is high in screwing speed, easy to store thread grease among joint threads, uniform in thread stress and strong in bearing capacity.
The purpose of the invention is realized as follows:
a four-line marine riser joint comprises a male joint with external taper threads and a female joint with internal taper threads, wherein the male joint and the female joint are in butt joint left and right for use;
the teeth of the inner-cone thread have the same height,
the outer taper threads are variable-tooth-height threads with the middle thread tooth height being equal, the threads on the two sides are variable-tooth-height threads with a section of circular arc as a boundary, the height between the middle thread and the threads on the two sides is changed in a nonlinear mode, the variable-tooth-height threads are cut by a cutting curve, the cutting curve is a circular arc with the radius r, r is 500 plus 600mm, and the convex surface of the cutting curve faces outwards; through the arc interception, the external taper thread is intercepted into an external thread with an arc-shaped surface from a thread with the same initial thread tooth height, and the first thread tooth of the external thread is intercepted 1/3-1/2 in the height direction; the last thread ridge of the external thread is cut 1/3-1/2 in the height direction, and one or more thread ridges in the middle of the external thread are not cut.
Preferably, the thread teeth at the middle part of the external conical thread are not cut and are fully contacted with the internal conical thread, the thread teeth at the two sides of the external conical thread are cut by the cut curve part, the bearing surface of the external conical thread at the cut part is reduced, and the contact area with the internal conical thread is reduced.
Preferably, the external taper thread and the internal taper thread are matched and used, and the external taper thread and the internal taper thread are both large taper threads with the taper of 1: 3.
Preferably, the thread line of the male connector thread comprises a male connector bearing surface and a male connector guide surface, the male connector guide surface is formed by transition of a first line segment of the male connector and a second line segment of the male connector, the included angle between the first line segment and the vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the second line segment of the male connector and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is larger than beta 1; on the same thread line, the male connector bearing surface is connected with the male connector guide surface through a male connector crest, a second thread section of the male connector is connected with the male connector crest, the bearing angle theta 1 of the male connector bearing surface is-3 to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface, the bottom of the male connector groove is a male connector root, a first thread section of the male connector is connected with the male connector root, the male connector root is a flat bottom, the taper direction of the male connector crest is opposite to the taper direction of the male connector outer taper thread, the included angle between the male connector crest and the axis is 5 to 15 degrees,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by a first female joint line segment and a second female joint line segment in a transition mode, the first female joint line segment is parallel to the first male joint line segment, the second female joint line segment is parallel to the second male joint line segment, the included angle between the first female joint line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the second female joint line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface is connected with a female joint guide surface through a female joint crest, a female joint second line section is connected with the female joint crest, a bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, a female joint tooth bottom is arranged at the bottom of the female joint groove, a female joint first line section is connected with a female joint tooth bottom, the female joint tooth bottom is a flat bottom, the taper direction of the female joint tooth bottom is opposite to the taper direction of a female-in-cone thread in the female joint, the included angle between the female joint tooth bottom and an axis is gamma, and gamma is 5-15 degrees.
Preferably, the thread line of the male connector thread comprises a male connector bearing surface and a male connector guide surface, the male connector guide surface is formed by transition of a first line segment of the male connector and a second line segment of the male connector, the included angle between the first line segment and the vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the second line segment of the male connector and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is larger than beta 1; on the same thread line, the bearing surface of the male connector and the guide surface of the male connector are connected through the crest of the male connector, the second thread section of the male connector is connected with the crest of the male connector, the crest of the male connector is flat, the bearing angle theta 1 of the bearing surface of the male connector is-3 to-7 degrees, a male connector groove is arranged between the guide surface of the male connector and the bearing surface of the male connector, the bottom of the male connector groove is a root of the male connector, the first thread section of the male connector is connected with the root of the male connector, the root of the male connector is an arc bottom, the taper direction of the crest of the male connector is opposite to the taper direction of an external taper thread of the male connector, the included angle between the crest of,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by a first female joint line segment and a second female joint line segment in a transition mode, the first female joint line segment is parallel to the first male joint line segment, the second female joint line segment is parallel to the second male joint line segment, the included angle between the first female joint line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the second female joint line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface is connected with a female joint guide surface through a female joint crest, a second line section of the female joint is connected with the female joint crest, the female joint crest is a flat top, a bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, the bottom of the female joint groove is a female joint root, a first line section of the female joint is connected with the female joint root, the female joint root is an arc, the taper direction of the female joint root is opposite to the taper direction of an internal taper thread of the female joint, the included angle between the female joint root and an axis is gamma, and gamma is 5 to 15 degrees.
Preferably, the thread crests of the male connector of the external taper threads, the guide surfaces of the male connector, the thread roots of the male connector and the thread roots of the female connector of the internal taper threads, the guide surfaces of the female connector and the pressing top of the female connector form a closed space in the screwing-on process.
Preferably, the male connector further comprises a small end face and a main shoulder, and the female connector further comprises a large end face and a secondary shoulder.
Preferably, a stress relieving groove is arranged at the tangent position of the secondary shoulder of the female joint and along the periphery of the secondary shoulder, the included angle phi between the oblique line of the stress relieving groove and the vertical direction is 45-65 degrees, meanwhile, the stress relieving groove and the secondary shoulder are in circular arc transition, and the circular arc radius of the circular arc transition is 1.3-2 mm.
Preferably, a sealing groove for placing a sealing ring is arranged at a position 10-15 mm away from the auxiliary shoulder of the female joint along the periphery of the female joint, the depth of the sealing groove is 4-6 mm, the width of the sealing groove is 5-7 mm, the sealing groove comprises a groove bottom, a first side surface and a second side surface, the first side surface is far away from the auxiliary shoulder of the female joint relative to the second side surface, the groove bottom is a horizontal line segment, the first side surface is a vertical line segment, and the inclination angle eta of the second side surface and the horizontal line is 50-70 degrees.
Preferably, four grooves are uniformly distributed at the tangent position of the main shoulder of the male connector, a locking block is arranged in each groove, a sawtooth belt is arranged on one side, which is in contact with the female connector, of each locking block, each locking block is connected with the male connector through a screw, and the male connector and the female connector are fixed through the locking blocks.
Compared with the prior art, the invention has the beneficial effects that:
the four-line marine riser joint has the advantages of high screwing speed, easiness in storing thread grease among joint threads, uniform thread stress and strong bearing capacity.
Drawings
FIG. 1 is an axial cross-sectional view of a completed make-up of a fitting
FIG. 2 shows the connection state of the thread after the make-up of the joint is completed
FIG. 3 shows an unconnected male and female connector
FIG. 4 is a partial enlarged view of a PT-4CQ thread
FIG. 5 is a partial enlarged view of a PT-4C thread ridge
FIG. 6 is a male connector shown in an uncut state
FIG. 7 is a cloud of joint stress distributions for a complete thread profile for a male joint
FIG. 8 is a cloud of stress distributions of a connection made up of an external taper thread according to the present invention
Fig. 9 is a top view of the locking piece.
Wherein:
the stress relief groove 3 is formed in the male joint 1, the female joint 2, the stress relief groove 3, the seal ring 4, the seal groove 5, the lock block 6, the screw 7, the groove 8, the internal thread crest 9, the internal thread root 10, the external thread crest 11, the external thread root 12, the line segment a13, the line segment b14, the line segment a '15, the line segment b' 16, the small end face 17, the auxiliary shoulder 18, the large end face 19, the main shoulder 20, the male joint bearing face 21, the female joint bearing face 22, the external tapered thread 23, the internal tapered thread 24, the third intermediate thread 26, the right second thread 27, the right first thread 28, the left second thread 29, the left first thread 30, the first intermediate thread 32, the second intermediate thread 32, the groove bottom 33, the first side 34, and the second side 35.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-9, a four-line marine riser joint is disclosed. Specifically, the models of the Chinese traditional medicine are divided into the following two types: PT-4CQ and PT-4C. As shown in the figure: a four-line marine riser joint comprises a male joint 1 with external taper threads and a female joint 2 with internal taper threads, wherein the male joint 1 and the female joint 2 are in butt joint left and right and are matched for use.
In the invention, the internal taper thread and the external taper thread are both four-start threads, which are beneficial to quick screwing, fig. 2 shows the connection state of thread teeth after screwing is finished, the male joint corresponding to the four-start threads is provided with a male joint first thread, a male joint second thread, a male joint third thread and a male joint fourth thread, the female joint corresponding to the four-start threads is provided with a female joint first thread, a female joint second thread, a female joint third thread and a female joint fourth thread, the male joint 1 and the female joint 2 are connected through the male joint first thread, the male joint second thread, the male joint third thread, the male joint fourth thread and the female joint first thread, the female joint second thread, the female joint third thread and the female joint fourth thread, and the threads of the male joint and the female joint are uniformly arranged at 4 × 90 °. The connection of the threads of the male connector and the threads of the female connector corresponds to fig. 2, the cooperation of the respective threads being 1 '1, 2' 2, 3 '3 and 4' 4, respectively.
Fig. 3 shows the male connector 1 and the female connector 2 when they are not connected.
FIG. 4 is a partial enlarged view of a thread tooth of a model PT-4CQ of a four-line marine riser joint, the thread is suitable for risers with the specification of 406.4 mm-660.4 mm, the joint thread pitch F is 6.43mm in the taper direction, and the thread tooth height H is 1.85-2.3 mm in the direction perpendicular to the taper.
Example 1(PT-4CQ)
Further explaining by taking the male connector as an example, the thread line of the thread of the male connector comprises a male connector bearing surface 21 and a male connector guide surface, the male connector guide surface is formed by transition of a first line segment 15 of the male connector and a second line segment 16 of the male connector, the included angle between the first line segment 15 and the vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the second line segment 16 of the male connector and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is more than beta 1; on the same thread line, a male connector bearing surface 21 and a male connector guide surface are connected through a male connector crest 11, the bearing angle theta 1 of the male connector bearing surface 21 ranges from-3 degrees to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface 21, the bottom of the male connector groove is a male connector root 12, the male connector root 12 is a flat bottom, the taper direction of the male connector crest 11 is opposite to the taper direction of a male connector outer taper thread, the included angle between the male connector crest 11 and the axis is gamma 1, and gamma 1 ranges from 5 degrees to 15 degrees.
Like the male connector, the thread path of the female connector thread includes a female connector bearing surface 22 and a female connector guide surface, the female connector guide surface is formed by the transition of a female connector first line section 13 and a female connector second line section 14, the female connector first line section 13 and the male connector first line section 15 are parallel, and the female connector second line section 14 and the male connector second line section 16 are parallel. The included angle between the first line section 13 of the female joint and the vertical line is alpha, alpha is 45-65 degrees, the included angle between the second line section 14 of the female joint and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface 22 and a female joint guide surface are connected through a female joint crest 9, the bearing angle theta of the female joint bearing surface 22 ranges from-3 degrees to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface 22, the bottom of the female joint groove is a female joint tooth bottom 10, the female joint tooth bottom 10 is a flat bottom, the taper direction of the female joint tooth bottom 10 is opposite to the taper direction of the female joint internal taper thread, the included angle gamma between the female joint tooth bottom 10 and the axis is gamma, and the gamma is 5-15 degrees.
Example 2(PT-4C)
FIG. 5 is a partial enlarged view of a PT-4C thread, which is suitable for a riser with the specification of 711.2 mm-914.4 mm, and is different from the embodiment 1 in that the thread root 10 and the thread root 12 of the male joint are circular arc bottoms, the radius R is 1.5-2 mm, and the thread crest 9 and the thread crest 11 of the female joint are flat tops. The pitch F of the joint in the taper direction is 10mm, and the height H of the thread teeth in the direction perpendicular to the taper is 3-5 mm. Taking the male connector as an example for further explanation, the guide surface of the male connector is formed by the transition of a first line segment 15 of the male connector and a second line segment 16 of the male connector, the included angle between the first line segment 15 of the male connector and the vertical line is alpha 1, alpha 1 is 45-65 degrees, and the second line segment 16 of the male connector is the same as the taper direction of the thread; on the same thread line, the bearing surface 21 of the male connector and the guide surface of the male connector are connected through the thread crest 11 of the male connector, and the bearing angle theta 1 of the bearing surface 21 of the male connector ranges from minus 3 degrees to minus 7 degrees.
Like the male connector, the PT-4C female connector thread guide surface is formed by the transition of a female connector first line section 13 and a female connector second line section 14, the female connector first line section 13 is parallel to the male connector first line section 15, and the female connector second line section 14 is parallel to the male connector second line section 16. The included angle between the first line section 13 of the female joint and the vertical line is alpha, the alpha is 45-65 degrees, the second line section 14 of the female joint is the same as the taper direction of the thread, on the same thread line, the bearing surface 22 of the female joint is connected with the guide surface through the crest 9, and the bearing angle theta of the bearing surface 22 of the female joint is-3 to-7 degrees.
In the invention, a closed space is formed by the thread crests 11 of the male connector of the external conical threads, the guide surface of the male connector, the thread roots 12 of the male connector, the thread roots 10 of the female connector of the internal conical threads, the guide surface of the female connector and the coping 9 of the female connector in the screwing-on process, and is used for storing thread grease and reducing friction force in the screwing-on process.
In the invention, the external taper thread and the internal taper thread are matched for use and are large taper threads with the taper of 1: 3; the inner tapered thread 24 has the same thread tooth height, the outer tapered thread 23 has the same thread tooth height in the middle, and the threads on both sides have variable tooth height threads with a section of circular arc as the boundary. The variable tooth height thread is formed by intercepting a intercepting curve, the intercepting curve is an arc with the radius of r, r is 500-600mm, and the convex surface of the intercepting curve faces outwards; through the arc, the external taper thread 23 is cut into an external thread with an arc-shaped surface from a thread with the same initial thread tooth height, and the first thread tooth of the external thread is cut 1/3-1/2 in the height direction; the last thread ridge of the external thread is cut in the height direction from 1/3 to 1/2, and 1-3 thread ridges in the middle of the external thread are not cut. Fig. 6a shows the pin 1 before cutting, and curve 31 shows the cut through curve, by which the external taper thread 23 of the pin is changed to a constant height of the middle thread and a non-linear change of the height of the two thread flanks, see fig. 6 b.
In the invention, the inner cone thread and the outer cone thread are matched for use, as shown in figure 2, after the thread is fastened, the bearing surfaces of the thread teeth are in close contact under the action of tensioning force, the thread teeth at the middle part of the outer cone thread are not intercepted and are fully contacted with the inner cone thread, as shown in figure 2, a first middle thread tooth 31, a second middle thread tooth 32 and a third middle thread tooth 26 are seen, the thread teeth at two sides of the outer cone thread are intercepted by the intercepted curve part, the bearing surfaces are correspondingly reduced, the contact area with the inner cone thread is reduced, and as shown in a right end second thread tooth 27, a right end first thread tooth 28, a left end second thread tooth 29 and a left end first thread tooth 30. By the method, the thread teeth are stressed uniformly under the action of the tensioning force, so that the bearing capacity of the thread is improved. FIG. 7 is a stress distribution cloud chart of a joint in which male joint outer cone threads are complete thread teeth when the interference of a main shoulder is 0.2mm and the interference of an auxiliary shoulder is 0.1mm, the maximum equivalent Cauchy stress of the thread teeth is 589MPa, the minimum Cauchy stress is 195MPa, and the ratio of the maximum stress to the minimum stress is 3.02: 1; fig. 8 is a stress distribution cloud chart of the joint obtained after the external taper thread of the male joint is cut when the interference of the main shoulder is 0.2mm and the interference of the auxiliary shoulder is 0.1mm, at this time, the maximum equivalent cauchy stress of the thread teeth is 511Mpa, the minimum cauchy stress is 230Mpa, and the ratio of the maximum stress to the minimum stress is 2.22: 1, it can be seen that the stress of the intercepted thread is relatively more uniform, and the bearing capacity is higher.
In the invention, a stress relieving groove 3 is arranged at the tangent position of the auxiliary shoulder of the female joint and along the periphery of the auxiliary shoulder 18, as shown in figure 3, the included angle phi between the oblique line of the relieving groove and the vertical direction is 45-65 degrees, and the oblique line of the relieving groove is in arc transition with the auxiliary shoulder, and the arc radius R of the transition arc is 1.3-2 mm.
According to the invention, a sealing groove for placing a sealing ring is arranged at a position 10-15 mm away from a secondary shoulder of a female joint along the periphery of the female joint, as shown in fig. 3, the depth L1 of the sealing groove is 4-6 mm, the width L2 is 5-7 mm, the sealing groove is composed of a groove bottom 33, a first side surface 34 and a second side surface 35, the first side surface 34 is far away from the secondary shoulder of the female joint relative to the second side surface 35, the groove bottom 33 is a horizontal line segment, the first side surface 34 is a vertical line segment, the inclination angle eta of the second side surface 35 to a horizontal line is 50-70 degrees, and the sealing ring 4 in the sealing groove is in interference fit with a male joint 1.
In the invention, four evenly distributed grooves 8 are arranged at the tangent of the main shoulder 20 of the male connector, and the grooves 8 are used for placing the locking blocks 6.
According to the invention, the side of the locking block 6, which is in contact with the female connector 2, is provided with the sawtooth belt, as shown in fig. 9, the locking block 6 is connected with the male connector 1 through the screw 7, and the male connector 1 and the female connector 2 are fixed through the locking block, so that the male connector and the female connector are prevented from being loosened under the action of impact load.
The above is only a specific application example of the present invention, and the protection scope of the present invention is not limited in any way. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.
Claims (10)
1. A four-line marine riser joint comprises a male joint with external taper threads and a female joint with internal taper threads, wherein the male joint and the female joint are in butt joint left and right for use;
the method is characterized in that:
the teeth of the inner-cone thread have the same height,
the outer taper threads are variable-tooth-height threads with the middle thread tooth height being equal, the threads on the two sides are variable-tooth-height threads with a section of circular arc as a boundary, the height between the middle thread and the threads on the two sides is changed in a nonlinear mode, the variable-tooth-height threads are cut by a cutting curve, the cutting curve is a circular arc with the radius r, r is 500 plus 600mm, and the convex surface of the cutting curve faces outwards; through the arc interception, the external taper thread is intercepted into an external thread with an arc-shaped surface from a thread with the same initial thread tooth height, and the first thread tooth of the external thread is intercepted 1/3-1/2 in the height direction; the last thread ridge of the external thread is cut 1/3-1/2 in the height direction, and one or more thread ridges in the middle of the external thread are not cut.
2. The four-wire marine riser joint of claim 1, wherein: the middle part of the outer conical thread is not intercepted, and is fully contacted with the inner conical thread, the threads on two sides of the outer conical thread are intercepted by the intercepting curve part, the bearing surface of the outer conical thread at the intercepting part is reduced, and the contact area with the inner conical thread is reduced.
3. The four-wire marine riser joint of claim 1, wherein: the external taper thread and the internal taper thread are matched for use and are large taper threads with the taper of 1: 3.
4. The four-wire marine riser joint of claim 1, wherein: the thread line of the male joint thread comprises a male joint bearing surface and a male joint guide surface, the male joint guide surface is formed by transition of a first line segment of the male joint and a second line segment of the male joint, the included angle between the first line segment and the vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the second line segment of the male joint and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is larger than beta 1; on the same thread line, the male connector bearing surface is connected with the male connector guide surface through a male connector crest, a second thread section of the male connector is connected with the male connector crest, the bearing angle theta 1 of the male connector bearing surface is-3 to-7 degrees, a male connector groove is arranged between the male connector guide surface and the male connector bearing surface, the bottom of the male connector groove is a male connector root, a first thread section of the male connector is connected with the male connector root, the male connector root is a flat bottom, the taper direction of the male connector crest is opposite to the taper direction of the male connector outer taper thread, the included angle between the male connector crest and the axis is 5 to 15 degrees,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by a first female joint line segment and a second female joint line segment in a transition mode, the first female joint line segment is parallel to the first male joint line segment, the second female joint line segment is parallel to the second male joint line segment, the included angle between the first female joint line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the second female joint line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface is connected with a female joint guide surface through a female joint crest, a female joint second line section is connected with the female joint crest, a bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, a female joint tooth bottom is arranged at the bottom of the female joint groove, a female joint first line section is connected with a female joint tooth bottom, the female joint tooth bottom is a flat bottom, the taper direction of the female joint tooth bottom is opposite to the taper direction of a female-in-cone thread in the female joint, the included angle between the female joint tooth bottom and an axis is gamma, and gamma is 5-15 degrees.
5. The four-wire marine riser joint of claim 1, wherein: the thread line of the male joint thread comprises a male joint bearing surface and a male joint guide surface, the male joint guide surface is formed by transition of a first line segment of the male joint and a second line segment of the male joint, the included angle between the first line segment and the vertical line is alpha 1, alpha 1 is 45-65 degrees, the included angle between the second line segment of the male joint and the vertical line is beta 1, beta 1 is 30-50 degrees, and alpha 1 is larger than beta 1; on the same thread line, the bearing surface of the male connector and the guide surface of the male connector are connected through the crest of the male connector, the second thread section of the male connector is connected with the crest of the male connector, the crest of the male connector is flat, the bearing angle theta 1 of the bearing surface of the male connector is-3 to-7 degrees, a male connector groove is arranged between the guide surface of the male connector and the bearing surface of the male connector, the bottom of the male connector groove is a root of the male connector, the first thread section of the male connector is connected with the root of the male connector, the root of the male connector is an arc bottom, the taper direction of the crest of the male connector is opposite to the taper direction of an external taper thread of the male connector, the included angle between the crest of,
the thread line of the female joint thread comprises a female joint bearing surface and a female joint guide surface, the female joint guide surface is formed by a first female joint line segment and a second female joint line segment in a transition mode, the first female joint line segment is parallel to the first male joint line segment, the second female joint line segment is parallel to the second male joint line segment, the included angle between the first female joint line segment and a vertical line is alpha, alpha is 45-65 degrees, the included angle between the second female joint line segment and the vertical line is beta, beta is 30-50 degrees, and alpha is larger than beta; on the same thread line, a female joint bearing surface is connected with a female joint guide surface through a female joint crest, a second line section of the female joint is connected with the female joint crest, the female joint crest is a flat top, a bearing angle theta of the female joint bearing surface is-3 to-7 degrees, a female joint groove is arranged between the female joint guide surface and the female joint bearing surface, the bottom of the female joint groove is a female joint root, a first line section of the female joint is connected with the female joint root, the female joint root is an arc, the taper direction of the female joint root is opposite to the taper direction of an internal taper thread of the female joint, the included angle between the female joint root and an axis is gamma, and gamma is 5 to 15 degrees.
6. The four-line marine riser joint of claim 4 or 5, wherein: in the screwing-on process, the thread crest of the male connector of the external conical thread, the guide surface of the male connector, the thread root of the female connector of the internal conical thread, the guide surface of the female connector and the pressing top of the female connector form a closed space.
7. The four-wire marine riser joint of claim 1, wherein: the male connector further comprises a small end face and a main shoulder, and the female connector further comprises a large end face and an auxiliary shoulder.
8. The four-wire marine riser joint of claim 7, wherein: and a stress relieving groove is arranged at the tangent position of the auxiliary shoulder of the female joint and along the periphery of the auxiliary shoulder, the included angle phi between the oblique line of the stress relieving groove and the vertical direction is 45-65 degrees, and meanwhile, the stress relieving groove and the auxiliary shoulder are in circular arc transition, and the circular arc radius of the circular arc transition is 1.3-2 mm.
9. The four-wire marine riser joint of claim 7, wherein: the sealing groove is 10-15 mm away from the auxiliary shoulder of the female joint, a sealing groove for placing a sealing ring is arranged along the periphery of the female joint, the depth of the sealing groove is 4-6 mm, the width of the sealing groove is 5-7 mm, the sealing groove is composed of a groove bottom, a first side face and a second side face, the first side face is far away from the auxiliary shoulder of the female joint relative to the second side face, the groove bottom is a horizontal line segment, the first side face is a vertical line segment, and the inclination angle eta of the second side face and the horizontal line is 50.
10. The four-wire marine riser joint of claim 7, wherein: the male connector is characterized in that four grooves which are uniformly distributed are formed in the positions tangent to the main shoulder of the male connector, a locking block is arranged in each groove, a sawtooth belt is arranged on one side, in contact with the female connector, of each locking block, each locking block is connected with the male connector through a screw, and the male connector and the female connector are fixed through the locking blocks.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910856655.1A CN110608322B (en) | 2019-09-11 | 2019-09-11 | Four-wire marine riser joint |
| PCT/CN2019/110501 WO2021046955A1 (en) | 2019-09-11 | 2019-10-11 | Four-line marine riser coupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910856655.1A CN110608322B (en) | 2019-09-11 | 2019-09-11 | Four-wire marine riser joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110608322A true CN110608322A (en) | 2019-12-24 |
| CN110608322B CN110608322B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910856655.1A Active CN110608322B (en) | 2019-09-11 | 2019-09-11 | Four-wire marine riser joint |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110608322B (en) |
| WO (1) | WO2021046955A1 (en) |
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| CN113027352A (en) * | 2021-03-26 | 2021-06-25 | 上海亦又新能源科技有限公司 | Drill rod joint for coal mining |
| CN115949811A (en) * | 2022-12-07 | 2023-04-11 | 毫厘机电(苏州)有限公司 | Water joint structure capable of improving plasticizing strength of adhesive and process method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110608322B (en) | 2024-04-12 |
| WO2021046955A1 (en) | 2021-03-18 |
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