Locking device and stand pipe supporting system

Abstract

The utility model provides a locking device and a stand pipe supporting system. The locking device comprises: a housing having an accommodating space therein; the locking plug is arranged in the containing space and can stretch out of the containing space to abut against the stand pipe hanging head; at least two adjusting holes are symmetrically formed in the periphery of the locking plug, and the length of the adjusting holes extends in the axial direction of the locking plug. The sealing element is arranged at the rear part of the locking plug and forms a sealed space with the shell; the connecting pipeline is communicated with the sealed space; the reset elastic assembly comprises an elastic body arranged in the locking plug and a limiting piece arranged corresponding to the adjusting hole, the two ends of the elastic body abut against the locking plug and the front end of the limiting piece respectively, and the rear end of the limiting piece extends out of the adjusting hole and cannot move in the axial direction through limitation of the shell; the locking plug moves towards the front end under the pressure of hydraulic fluid to abut against the stand pipe hanging head to achieve the locking function, and when the hydraulic fluid flows out of the sealed space, the elastic body resets to drive the locking plug to move towards the rear end.

Description

Technical Field

[0001] The utility model relates to the technical field of marine engineering, in particular to a locking device and a riser support system. Background Art

[0002] In the riser system of offshore oil and gas production platforms, risers are used to connect the seabed wellhead and the floating oil and gas production platform FPSO (Floating Production Storage and Offloading, FPSO for short). Under the action of wind load and wave flow, there are different multi-directional shaking movements between the floating FPSO and the oil and gas riser. Under storm conditions, the shaking movement between the huge floating oil and gas platform FPSO hull and the riser will generate hundreds of tons of lateral loads. In the FPSO multi-point mooring riser suspension and support equipment, there is a gap between the inner diameter of the penetration riser support equipment and the riser suspension head. This gap and shaking movement between each other will cause the riser suspension head to shake, wear, impact, fatigue damage, etc. in the penetration support equipment, which will not only reduce the working life of the riser, but also cause fatigue damage and loosening of the connecting bolts at the connection flange of the riser suspension head, thereby causing leakage and other faults at the connection flange on the oil and gas riser.

[0003] For the rigid risers of multi-point moored floating oil and gas production platforms FPSO, the pipe gallery under the structure connecting the support risers on the FPSO hull is located below the waterline, and the penetrating riser suspension and support equipment and oil and gas riser connection flanges are also located underwater. This brings challenges to solving the problems caused by this gap and shaking.

[0004] At present, mechanical bolt locking and hydraulic cylinder locking are usually used to eliminate or slow down the shaking movement between the riser and the penetrating riser support equipment. However, since the penetrating riser support equipment is located underwater, mechanical bolt locking requires the use of underwater robots, divers, and related support ships, which takes a long time, has high risks, and is costly. Conventional hydraulic cylinder locking will cause the locking to loosen due to slow leakage of the hydraulic cylinder, affecting the locking effect. Utility Model Content

[0005] The utility model aims to provide a locking device and a riser support system with good sealing performance and substantially no leakage, so as to solve the problem of poor locking effect in the prior art.

[0006] In order to solve the above technical problems, the utility model provides a locking device, comprising:

[0007] The shell has an accommodating space inside and a plug hole communicating with the accommodating space is provided at the front end; the front end of the shell is used to connect with the riser support device;

[0008] A locking plug is arranged in the accommodating space and can extend out of the accommodating space through the plug hole to abut against the riser suspension head; the locking plug is closed at both axial ends, hollow inside, and has at least two symmetrically arranged adjustment holes on the outer circumference, and the length of the adjustment hole extends along the axial direction of the locking plug;

[0009] A sealing member, which is arranged at the rear of the locking plug and is enclosed with the housing to form a sealed space;

[0010] A connecting pipeline, which is in communication with the sealed space; the other end of the connecting pipeline is used to connect to a storage element to provide hydraulic fluid into the sealed space;

[0011] A reset elastic component, comprising an elastic body arranged inside the locking plug and a stopper arranged corresponding to the adjusting hole, wherein two ends of the elastic body respectively abut against the locking plug and the front end of the stopper, and the rear end of the stopper extends through the adjusting hole and cannot move axially due to the limitation of the housing;

[0012] Wherein, the locking plug moves toward the front end under the pressure of the hydraulic fluid and abuts against the riser suspension head to realize the locking function. When the hydraulic fluid flows out of the sealing space, the elastic body resets and drives the locking plug to move toward the rear end.

[0013] In one embodiment, the sealing member comprises a sealing cylinder with a cylindrical structure and a sealing plate arranged at the front end of the sealing cylinder, the rear end of the sealing cylinder is closed and the front end is open, the sealing plate extends outwardly beyond the sealing cylinder, and the rear end of the locking plug can be located in the sealing cylinder;

[0014] The outer shell includes a front shell and a rear cover arranged at the rear end of the front shell, the rear cover includes a cover body and a positioning tube, the front end of the cover body is provided with a first docking ring protruding outward, the rear end of the positioning tube is provided with a second docking ring, the second docking ring is docked with the first docking ring, the sealing plate is arranged between the first docking ring and the second docking ring, and the sealing component and the cover body enclose the sealed space.

[0015] In one embodiment, an extension portion is integrally extended outward from the outer circumference of the sealing cylinder, and the extension portion is corrugated;

[0016] The extension portion includes at least two wave peak portions which are spaced apart from each other.

[0017] In one embodiment, the sealing member further comprises at least one sealing ring, and the sealing ring is disposed on the rear side of the sealing plate;

[0018] The front end of the cover body is provided with at least one sealing groove, the sealing groove and the sealing ring are arranged one by one, the opening of the sealing groove faces forward, and the sealing ring is clamped in the corresponding sealing groove;

[0019] The cross section of the sealing ring is semicircular, with its protrusion facing rearward, and the shape of the sealing groove is adapted to the shape of the sealing ring.

[0020] In one embodiment, the limiting member includes a limiting plate and an abutting plate which are arranged in parallel and spaced apart from each other, and a transition plate connecting the limiting plate and the abutting plate, wherein the limiting plate and the abutting plate are arranged on both sides of the transition plate;

[0021] A receiving groove is provided on the inner peripheral wall of the shell, the opening of the receiving groove is inward, the limiting plate is located in the receiving groove, the transition plate and the abutment plate are located inside the locking plug, and the abutment plate is used to abut against the front end of the elastic body.

[0022] In one embodiment, the reset elastic component includes a base plate, which is arranged between the limit member and the elastic body, and the outer periphery of the base plate is flush with the outer periphery of the front end of the elastic body or extends outwardly beyond the outer periphery of the front end of the elastic body.

[0023] In one embodiment, the outer shell includes a front shell and a rear cover arranged at the rear end of the front shell, the rear end of the rear cover is closed, and the front end is open, both ends of the front shell are open, the front end of the rear cover extends into the front shell, and a step is provided on the inner circumferential wall of the front shell, the front end of the rear cover and the step together form a receiving groove, the opening of the receiving groove faces inward, and the receiving groove receives the portion of the limit member extending out of the adjustment hole.

[0024] In one embodiment, the front shell includes a detachably connected connecting seat and a mounting seat arranged at the front end of the connecting seat, the connecting seat has openings at both ends, the mounting seat has openings at both ends, the connecting seat is provided with a first limiting boss protruding outward on the outer periphery 11, and the mounting seat is provided with a second limiting boss protruding outward, and the first limiting boss cooperates with the second limiting boss to form a limiting space.

[0025] In one embodiment, the connecting seat includes a first barrel section and a second barrel section located at the rear end of the first barrel section, the inner diameter of the second barrel section is larger than the inner diameter of the first barrel section, and the step is formed between the front end of the second barrel section and the rear end of the first barrel section;

[0026] The first cylinder segment is provided with a plurality of first connecting holes, which are arranged at intervals along the circumference of the first cylinder segment, and the axes of the first connecting holes are parallel to the axes of the first cylinder segment, and the first connecting holes penetrate the first cylinder segment; the mounting seat is provided with a second connecting hole corresponding to the first connecting hole, and the second connecting hole is a blind hole, and fasteners are passed through the first connecting hole and the second connecting hole to realize a detachable connection between the connecting seat and the mounting seat.

[0027] In one embodiment, the rear cover includes a cover body and a positioning tube, a first docking ring is provided at the rear end of the positioning tube, a second docking ring is provided at the front end of the cover body, and the first docking ring is docked with the second docking ring;

[0028] A connecting ring protrudes outward from the rear end of the front shell, the connecting ring is closely connected to the front end of the second docking ring, and the positioning tube extends into the front shell;

[0029] The first docking ring is detachably connected to the second docking ring, and the connecting ring is detachably connected to the second docking ring.

[0030] In one embodiment, a locking valve is provided on the connecting pipeline, and the locking valve is located outside the housing;

[0031] The locking valve is in communication with a control component, and the control component is disposed on the platform.

[0032] In one embodiment, the locking device further includes a pressure detection component for detecting the real-time pressure in the sealed space. The pressure detection component is communicatively connected with the locking valve. When the real-time pressure reaches a preset pressure value, the locking valve is closed.

[0033] The utility model also provides a riser support system, comprising a riser support device and a plurality of locking devices as described above arranged on the outer circumference of the riser support device, wherein the plurality of locking devices are evenly arranged along the circumference of the riser support device.

[0034] It can be seen from the above technical solution that the advantages and positive effects of the utility model are:

[0035] The locking device of the utility model realizes long-term and good sealing of the locking device through the sealing member, thereby ensuring the locking effect. By resetting the elastic component, the locking device can overcome the back pressure of the hydraulic system and move the locking plug to the rear end, so that the locking device can be locked according to the environment and different working conditions, thereby improving the locking effect of the locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1It is a partial three-dimensional structural effect diagram of one embodiment of the locking device in the utility model.

[0037] Figure 2 It is a cross-sectional effect diagram of the locking device in the utility model.

[0038] The following are the descriptions of the reference numerals:

[0039] 1. Shell; 11. Front shell; 111. Connecting seat; 112. Mounting seat; 113. Connecting ring; 114. First limiting boss; 115. Second limiting boss; 12. Back cover; 121. Cover body; 122. Positioning cylinder; 123. First docking ring; 124. Second docking ring; 2. Locking plug; 21. Adjusting hole; 31. Sealing cylinder; 32. Sealing plate; 33. Extension part; 34. Sealing ring; 4. Connecting pipeline; 51. Elastomer; 52. Limiting member; 521. Limiting plate; 522. Abutting plate; 523. Transition plate; 53. Bottom plate; 6. Locking valve. DETAILED DESCRIPTION

[0040] Although the present invention can be easily embodied as embodiments of different forms, only some of the specific embodiments are shown in the drawings and described in detail in this specification. It should be understood that this description should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to that described herein.

[0041] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0042] In the embodiments shown in the drawings, the indications of directions (such as up, down, left, right, front and back) used to explain the structure and movement of various elements of the utility model are not absolute but relative. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, the indications of these directions also change accordingly.

[0043] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0044] It should be noted that the FPSO includes a hull, a ship-side pipeline arranged on the outside of the hull, and a riser support system arranged on the outer side of the hull near the bottom of the hull. Among them, the riser comes from the oil well of the seabed underwater production system, which is suspended on the outside of the hull through the riser support system. There is a processing module on the deck of the hull, and the processing module has a plurality of processing units, and the outlet of the processing unit is connected to the ship-side pipeline. Among them, the number of ship-side pipelines can be set according to actual needs. Adaptively, the riser support system corresponds to the ship-side pipeline setting. For example, one of the processing units is used to separate carbon dioxide from crude oil, and the carbon dioxide enters the riser through the ship-side pipeline, and is transported to the underwater wellhead and injected into the underground oil layer for oil displacement, which increases the oil field recovery rate while partially sealing the carbon dioxide.

[0045] The lower end of the riser is located under the seabed, and a riser suspension head is provided at the top. The riser suspension head is supported on the outside of the hull through a riser support system.

[0046] The utility model provides a riser support system. During the installation, connection and release of the riser, there is no need for divers to dive and underwater robots to perform load-bearing operations. Operators can basically complete the operations on the deck, which greatly reduces the work intensity of workers and the impact of bad weather on the operations, and improves work safety and efficiency.

[0047] The riser support system comprises a riser support device and a plurality of locking devices arranged on the outer periphery of the riser support device. The plurality of locking devices are evenly arranged along the circumference of the riser support device.

[0048] The riser support device is fixed to the side of the hull in the up-down direction and is fixed to the outrigger structure close to the bottom of the hull.

[0049] Specifically, the riser support device is cylindrical and has openings at both ends. The riser support device is used for the riser suspension head to pass through it, so that the multiple locking devices cooperate to lock the riser suspension head.

[0050] In the following, a description is given by taking the case where a plurality of locking devices located in the same plane are arranged on the periphery of the riser support device as an example. In other embodiments, a plurality of locking devices located in two or more planes at different heights may be arranged on the periphery of the riser support device, i.e., a multi-layer arrangement is formed, and each layer includes a plurality of locking devices uniformly arranged along the circumferential direction.

[0051] The riser support device is provided with a plurality of mounting holes along the circumferential direction, and the axes of the mounting holes are perpendicular to the axes of the riser support device. That is, the axes of the mounting holes extend along the radial direction of the riser support device. The mounting holes are used for the locking device to pass through and be installed.

[0052] Preferably, the number of locking devices is an even number, that is, the locking devices are arranged in pairs. Correspondingly, the number of mounting holes is also an even number. In this embodiment, a riser support system includes eight locking devices. In other embodiments, the number of locking devices can be set according to actual needs.

[0053] Wherein, the locking device is arranged in the middle of the axial length of the riser support device.

[0054] A plurality of locking devices are evenly arranged along the circumferential direction, and abut against the riser suspension head located in the riser support device from multiple directions, thereby locking the riser suspension head.

[0055] The locking device in the present application is described in detail below.

[0056] Figure 1 A partial three-dimensional effect diagram of one embodiment of the locking device is shown. Figure 2 A cross-sectional view of one embodiment of the locking device is shown, Figure 1 and Figure 2 The locking device includes a shell 1, a locking plug 2, a sealing member, a connecting pipe 4 and a reset elastic component. The shell 1 has an accommodating space inside, and a plug hole communicating with the accommodating space is provided at the front end. The front end of the shell 1 is used to connect with the riser support device. The locking plug 2 is arranged in the accommodating space, and can extend out of the accommodating space through the plug hole to abut against the riser suspension head; the locking plug 2 is hollow inside, and at least two symmetrically arranged adjustment holes 21 are provided on the outer periphery, and the length of the adjustment hole 21 extends along the axial direction of the locking plug 2. The sealing member is arranged at the rear of the locking plug 2 and encloses the shell 1 to form a sealed space. The connecting pipe 4 is in communication with the sealed space; the other end of the connecting pipe 4 is used to connect to the storage member to provide hydraulic fluid to the sealed space. The resetting elastic assembly includes an elastic body 51 disposed inside the locking plug 2 and a stopper 52 disposed corresponding to the adjustment hole 21. The two ends of the elastic body 51 abut against the front ends of the locking plug 2 and the stopper 52 respectively. The rear end of the stopper 52 extends through the adjustment hole 21 and cannot move axially due to the restriction of the housing 1. The locking plug 2 moves toward the front end under the pressure of the hydraulic fluid and abuts against the riser suspension head to realize the locking function. When the hydraulic fluid flows out of the sealed space, the elastic body 51 is reset to drive the locking plug 2 to move toward the rear end.

[0057] The sealing element achieves long-term and good sealing of the locking device, thereby ensuring the locking effect. The resetting elastic component enables the locking device to overcome the back pressure of the hydraulic system and move the locking plug 2 to the rear end, thereby enabling the locking device to be locked according to the environment and different working conditions, thereby improving the locking effect of the locking device.

[0058] The housing 1 has an accommodating space inside, and a plug hole communicating with the accommodating space is provided at the front end. Specifically, the housing 1 includes a front housing 11 and a rear cover 12 disposed at the rear end of the front housing 11. The front housing 11 and the rear cover 12 are detachably connected, so that the locking device is easy to install, maintain and disassemble.

[0059] The rear end of the rear cover 12 is closed, and the front end is open. Specifically, the rear cover 12 includes a cover body 121 and a positioning tube 122 .

[0060] The cover body 121 is in a cylindrical shape with one end open and the other end closed. A through hole is formed on the rear end of the cover body 121.

[0061] A first docking ring 123 is protruded outwardly from the front end of the cover body 121 . That is, the first docking ring 123 extends outwardly beyond the outer peripheral wall of the cover body 121 .

[0062] The cover 121 and the first docking ring 123 may be integrally formed. The cover 121 may also be fixed to the first docking ring 123 by welding.

[0063] Preferably, the first docking ring 123 and the cover body 121 are coaxially arranged.

[0064] Specifically in this embodiment, the inner side of the first docking ring 123 inwardly exceeds the inner side wall of the cover body 121. There is a gap between the inner wall of the first docking ring 123 and the outer peripheral wall of the locking plug 2 in the radial direction.

[0065] Both ends of the positioning tube 122 are open. A second docking ring 124 is provided at the rear end of the positioning tube 122. The second docking ring 124 is docked with the first docking ring 123.

[0066] In this embodiment, the second docking ring 124 is flush with the outer circumference of the first docking ring 123 .

[0067] The first docking ring 123 is detachably connected to the second docking ring 124. In this embodiment, threaded holes are provided on the first docking ring 123 and the second docking ring 124, and the detachable connection between the two is achieved by fasteners.

[0068] Both ends of the front shell 11 are open, wherein the opening at the front end of the front shell 11 constitutes a plug hole for the locking plug 2 to extend and retract.

[0069] The rear end of the front shell 11 protrudes outward with a connecting ring 113, which is fitted and connected to the front end of the second docking ring 124, and the positioning tube 122 extends into the front shell 11. The connecting ring 113 and the second docking ring 124 are detachably connected, thereby realizing a detachable connection between the front shell 11 and the rear cover 12.

[0070] Specifically in this embodiment, threaded holes are provided on the second docking ring 124 and the connecting ring 113, and the fasteners are passed through both to achieve a detachable connection. Further, the threaded holes on the first docking ring 123, the second docking ring 124 and the connecting ring 113 are correspondingly provided, and the fasteners simultaneously achieve a detachable connection between the three.

[0071] A step is provided on the inner peripheral wall of the front shell 11 , and the front end of the rear cover 12 and the step together form a receiving groove, the opening of the receiving groove faces inward, and the receiving groove receives the portion of the limiting member 52 extending out of the adjustment hole 21 .

[0072] The step divides the inner diameter of the front shell 11 into two sizes, and the inner diameter of the front shell 11 at the front end is smaller than the inner diameter of the front shell 11 at the rear end. When the positioning cylinder 122 extends into the front shell 11, there is a gap between the front end of the positioning cylinder 122 and the first step along the axial direction, so the positioning cylinder 122 and the step together enclose a receiving groove. Among them, the inside and the outside are based on the use state of the entire shell 1, and the direction toward the internal receiving space of the shell 1 is the inside, and the opposite direction is the outside.

[0073] Specifically, the front shell 11 includes a detachably connected connection seat 111 and a mounting seat 112 disposed at the front end of the connection seat 111 .

[0074] The connection base 111 has two openings at its two ends. The connection ring 113 is disposed at the rear end of the connection base 111 and protrudes outward from the connection base 111. The positioning tube 122 is located in the connection base 111.

[0075] The detachable connection between the connecting seat 111 and the mounting seat 112 can facilitate the installation of the entire locking device on the standpipe supporting device.

[0076] Specifically, the connecting seat 111 includes a first barrel section and a second barrel section located at the rear end of the first barrel section. The inner diameter of the second barrel section is larger than the inner diameter of the first barrel section, and a step is formed between the rear end of the second barrel section and the front end of the first barrel section. The front end of the positioning barrel 122, the inner circumferential wall of the second barrel section, and the rear end of the first barrel section together form a receiving groove.

[0077] The first cylinder section is provided with a plurality of first connection holes, which are arranged at intervals along the circumference of the first cylinder section. The axis of the first connection hole is parallel to the axis of the first cylinder section, and the first connection hole runs through the first cylinder section. The mounting seat 112 is provided with a second connection hole corresponding to the first connection hole, and the second connection hole is a blind hole. The second connection hole is open at the rear end and closed at the front end. The fastener is inserted into the first connection hole and the second connection hole to realize the detachable connection between the connecting seat 111 and the mounting seat 112.

[0078] The mounting seat 112 has openings at both ends. The opening at the front end of the mounting seat 112 is a plug hole. In this embodiment, the inner diameter of the mounting seat 112 is consistent with the inner diameter of the front end of the connecting seat 111, that is, the inner diameter of the mounting seat 112 is consistent with the inner diameter of the first barrel section. The inner diameter of the front end of the connecting seat 111 is consistent with the inner diameter of the positioning tube 122, that is, the inner diameter of the first barrel section is consistent with the inner diameter of the positioning tube 122.

[0079] A first limiting boss 114 is protruded outwardly from the outer circumference of the connecting seat 111 , and a second limiting boss 115 is protruded outwardly from the mounting seat 112 . The first limiting boss 114 cooperates with the second limiting boss 115 to form a limiting space.

[0080] In this embodiment, the first limiting boss 114 is the second cylinder section of the connecting seat 111 .

[0081] When the locking device is installed on the riser support device, the mounting seat 112 is placed from the inside of the riser support device into the mounting hole on the riser support device, and the second limiting boss 115 on the mounting seat 112 abuts against the riser support device to limit the mounting seat 112 from moving outward. The connecting seat 111 is butt-connected with the mounting seat 112 to complete the installation of the locking device on the riser support device. The first limiting boss 114 can also abut against the riser support device, thereby limiting the radial movement of the riser device and the locking device along the riser device.

[0082] The interval between the first limiting boss 114 and the second limiting boss 115 is designed according to the thickness of the standpipe support device, so that the standpipe support device is just stuck in the limiting space.

[0083] The locking plug 2 is closed at both ends of the axial direction and is hollow inside. The hollow inside of the locking plug 2 forms a receiving space. At least two symmetrically arranged adjustment holes 21 are opened on the outer periphery, and the length of the adjustment holes 21 extends along the axial direction of the locking plug 2. The adjustment holes 21 are connected to the receiving space.

[0084] The position of the adjustment hole 21 in the axial direction of the locking plug 2 and the axial size of the adjustment hole 21 are set according to the specific use environment of the locking device, specific working conditions and the like.

[0085] When the locking plug 2 moves in the housing 1, the positioning tube 122 guides and positions the locking plug 2. In this embodiment, the connecting seat 111 and the mounting seat 112 are also adapted to the locking plug 2 to guide and position the locking plug 2.

[0086] The sealing member is arranged at the rear of the locking plug 2 and is enclosed with the housing 1 to form a sealed space.

[0087] Specifically, the sealing member includes a sealing cylinder 31 in a cylindrical structure and a sealing plate 32 arranged at the front end of the sealing cylinder 31. The rear end of the sealing cylinder 31 is closed and the front end is open. The rear end of the locking plug 2 can be located in the sealing cylinder 31. That is, the sealing cylinder 31 is sleeved on the rear end of the locking plug 2.

[0088] The seal is made of rubber.

[0089] The sealing tube 31 at least covers the rear portion of the locking plug 2 .

[0090] Further, an extension portion 33 is integrally extended outward from the outer circumference of the sealing cylinder 31. The extension portion 33 is corrugated. By setting the extension portion 33, the stretching stroke of the sealing cylinder 31 is increased, thereby meeting the requirement that the locking plug 2 is stretched when moving toward the rear end.

[0091] The extension portion 33 includes at least two wave crests arranged at intervals. In this embodiment, the extension portion 33 includes three wave crests. In other embodiments, the number of the wave crests can also be two, four or other numbers, which are specifically set according to actual needs.

[0092] The sealing plate 32 extends outwardly beyond the sealing tube 31. The sealing plate 32 is disposed between the first docking ring 123 and the second docking ring 124. The sealing member and the cover body 121 enclose a sealed space.

[0093] Furthermore, there is a smooth transition between the sealing plate 32 and the sealing cylinder 31. The inner side of the front end of the positioning cylinder 122 has a rounded corner. That is, there is a smooth transition between the front end of the positioning cylinder 122 and the inner peripheral wall.

[0094] The inner wall of the positioning tube 122 extends inwardly beyond the cover body 121 and is close to the sealing tube 31, and there is a gap between the positioning tube 122 and the sealing tube 31. Through the above design, the inner wall of the positioning tube 122 guides the expansion and contraction of the sealing tube 31.

[0095] The sealing member also includes at least one sealing ring 34, which is disposed on the rear side of the sealing plate 32. The front end of the cover body 121 is provided with at least one sealing groove. The sealing grooves are arranged in a one-to-one correspondence with the sealing rings 34. The openings of the sealing grooves face forward, and the sealing rings 34 are clamped in the corresponding sealing grooves. The sealing rings 34 further enhance the sealing performance.

[0096] The number of the sealing ring 34 can be one, two or other numbers, which is set according to the actual situation.

[0097] Preferably, the cross section of the sealing ring 34 is semicircular, with its protrusion facing rearward, and the shape of the sealing groove is adapted to the shape of the sealing ring 34 .

[0098] The sealing effect of the sealing element ensures the sealing performance of the entire locking device, so that the locking device has long-term and good sealing performance.

[0099] The connecting pipe 4 is connected to the through hole of the rear cover 12, and further connected to the sealed space. The other end of the connecting pipe 4 is used to connect to the storage element to provide hydraulic fluid into the sealed space. The storage element storing the hydraulic fluid can be arranged on the hull.

[0100] A locking valve 6 is provided on the connecting pipeline 4. The locking valve 6 is located outside the housing 1. When the locking valve 6 is opened, the hydraulic fluid can enter the sealed space. When the locking valve 6 is closed, the sealed space is sealed by the hydraulic fluid. The hydraulic fluid can be regarded as incompressible, so that leakage-free sealing, hydraulic pre-compression and locking functions can be achieved by the hydraulic fluid.

[0101] The locking valve 6 is connected to the control unit in communication. The control unit is arranged on the platform. The control unit is used to control the opening and closing of the locking valve 6. That is, the locking valve 6 is opened and closed by the control unit located on the platform, and the locking and unlocking are realized by remote control on the water, which greatly reduces the underwater operation of the diver. In this embodiment, the control unit is arranged on the hull.

[0102] The locking device also includes a pressure detection member. The pressure detection member is used to detect the real-time pressure in the sealed space. The pressure detection member is in communication connection with the locking valve 6. When the real-time pressure reaches a preset pressure value, the locking valve 6 is closed, and the delivery of hydraulic fluid to the sealed space is stopped.

[0103] The elastic body 51 is elastic and can be compressed when receiving pressure and can be reset when the external force is removed. In this embodiment, the elastic body 51 is a spring.

[0104] The elastic body 51 is located inside the locking plug 2. That is, the elastic body 51 is located in the receiving space.

[0105] The limiting member 52 includes a limiting plate 521 and an abutting plate 522 which are arranged in parallel and spaced apart, and a transition plate 523 connecting the limiting plate 521 and the abutting plate 522. The limiting plate 521 and the abutting plate 522 are arranged on both sides of the transition plate 523. The limiting member 52 is Z-shaped.

[0106] The limiting plate 521 is located in the receiving groove of the housing 1. The transition plate 523 and the abutting plate 522 are located inside the locking plug 2, and the abutting plate 522 is used to abut against the front end of the elastic body 51. The limiting plate 521 extends out of the locking plug 2 from the adjustment hole 21 on the locking plug 2 and is located in the receiving groove. That is, the limiting member 52 cannot move relative to the housing 1. When the locking plug 2 moves relative to the housing 1, the movement of the locking plug 2 in the axial direction is limited by the abutment between the limiting member 52 and the front end wall or the rear end wall of the adjustment hole 21.

[0107] In this embodiment, the locking plug 2 is provided with four adjustment holes 21, and the number of the limiting members 52 is four. In other embodiments, the number of the adjustment holes 21 and the limiting members 52 can also be other, which is specifically set according to actual needs.

[0108] The plurality of abutting plates 522 abut against the elastic body 51. In this embodiment, the abutting plates 522 of the plurality of limiting members 52 are spaced apart along the radial direction of the locking plug 2.

[0109] Furthermore, the resetting elastic component includes a bottom plate 53. The bottom plate 53 is disposed between the stopper 52 and the elastic body 51, and the outer periphery of the bottom plate 53 is flush with the outer periphery of the front end of the elastic body 51 or outwardly exceeds the outer periphery of the front end of the elastic body 51.

[0110] Specifically, the bottom plate 53 is disposed at the rear ends of the plurality of abutment plates 522. By disposing the bottom plate 53, the ends of the front ends of the elastic body 51 can all contact with the bottom plate 53, so that the elastic body 51 is subjected to a more uniform force.

[0111] The installation process of the locking device is as follows:

[0112] The rear cover 12 and the sealing member are first connected as one body and defined as a first assembly. Specifically, the cover body 121 and the positioning tube 122 sandwich the sealing plate 32 of the sealing member in the middle and connect the cover body 121 and the positioning tube 122.

[0113] The locking plug 2 and the resetting elastic component are connected as a whole and defined as a second component. Specifically, the stopper 52 , the bottom plate 53 and the elastic body 51 are placed inside the locking plug 2 .

[0114] The mounting seat 112 is placed on the inner periphery of the riser support device, and the mounting seat 112 is extended from the mounting hole, and the connecting seat 111 is arranged corresponding to the mounting seat 112. The mounting seat 112 and the connecting seat 111 are connected by fasteners, so that the mounting seat 112 and the connecting seat 111 are installed on the riser support device. In this embodiment, the fasteners here are deep hole bolts.

[0115] Insert the second component into the front shell 11 formed by the mounting seat 112 and the connecting seat 111, then sleeve the first component on the outer periphery of the locking plug 2, and dock the second docking ring 124 of the positioning tube 122 with the connecting ring 113, and connect them through fasteners to complete the installation of a locking device.

[0116] Repeat the above steps to install multiple locking devices on the riser support device.

[0117] The working principle of the locking device is as follows:

[0118] The locking valve 6 is opened, and the hydraulic fluid enters the sealed space. The locking valves 6 of multiple locking devices are opened at the same time, and the hydraulic fluid enters the sealed space at the same time. Under the hydraulic pressure, the locking plug 2 overcomes the elastic pressure of the elastic body 51 and moves toward the front end along the positioning cylinder 122 and the inner wall of the front shell 11.

[0119] The hydraulic fluid continues to enter the sealed space, causing the locking plug 2 to move forward, so that the front end of the locking plug 2 contacts the riser suspension head. When the pressure in the sealed space reaches a preset pressure value, the locking valve 6 is closed to stop delivering the hydraulic fluid.

[0120] When the locking needs to be released, the locking valve 6 is opened, the hydraulic fluid flows out of the sealed space, the pressure in the sealed space drops, and the locking plug 2 moves to the rear end under the resetting action of the elastic body 51, thereby releasing the locking.

[0121] When the locking device is working, that is, when the locking plug 2 locks the riser suspension head, as the FPSO hull and the riser shake and move with waves, the riser suspension head will change the direction of force in the riser suspension device according to a corresponding time period, and the front end of the locking plug 2 of the locking device in the corresponding direction will periodically bear the corresponding load, and the hydraulic pressure of the locking device will also change accordingly.

[0122] The hydraulic fluid itself is incompressible, and the hydraulic pressure in the sealing area will increase accordingly. Therefore, each component of the sealing space is designed according to the corresponding maximum possible load, withstands the corresponding hydraulic pressure load, and realizes the locking function under the maximum load condition.

[0123] When the environmental conditions become severe or the working conditions of the FPSO vessel and the riser change, resulting in a greater lateral load on the riser suspension head relative to the locking device in the radial direction, the front end of the locking plug 2 of the locking device in this direction transfers the corresponding load to the rear end of the locking plug 2, and then transfers it to the hydraulic fluid in the sealing space through the elastomer 51 and the seal.

[0124] The beneficial effects of the locking device in this embodiment are as follows:

[0125] 1. A good seal is achieved through the seal, and a long-term leak-free locking function is achieved. The sealing cylinder, extension, sealing plate and sealing ring of the seal are integrally formed into an integrated flexible seal. Compared with the related art that achieves sealing through a guide sleeve, an annular sealing device and a sealing pressing device, the seal improves the sealing effect, does not leak high-pressure liquid, and ensures a long-term, good sealing effect, thereby ensuring that the required high pressure can be achieved for a long time.

[0126] 2. The reset elastic component provides the locking plug with power to move backward and retract into the housing, so that the locking plug is reset and the unlocking function of the locking device is realized. That is, the locking plug of the locking device can extend out of the housing through hydraulic pressure or retract into the housing through the reset elastic component, so that the locking device can be locked by adaptive adjustment according to environmental conditions.

[0127] 3. The housing includes a detachably connected front housing and a rear cover, which facilitates the installation and removal of the locking device. Furthermore, the front housing includes a detachably connected connection seat and a mounting seat, which facilitates the installation and removal of the locking device and the riser support device. The detachable connection between the rear cover and the front housing facilitates the assembly and removal of the locking device itself, and facilitates the removal for repair and replacement when an internal component fails.

[0128] 4. The locking and unlocking on water can be realized through the locking valve remotely controlled on water, which greatly reduces the underwater work of divers.

[0129] Although the utility model has been described with reference to several typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the utility model can be implemented in a variety of forms without departing from the spirit or essence of the utility model, it should be understood that the above-mentioned embodiments are not limited to any of the aforementioned details, but should be widely interpreted within the spirit and scope defined by the attached claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the attached claims.

Claims

1. A locking device, characterized in that: include: The housing has a receiving space inside and a plug hole communicating with the receiving space is provided at the front end; The front end of the housing is used to connect with the riser support device; A locking plug is arranged in the accommodating space and can extend out of the accommodating space through the plug hole to abut against the riser suspension head; the locking plug is closed at both axial ends, hollow inside, and has at least two symmetrically arranged adjustment holes on the outer circumference, and the length of the adjustment hole extends along the axial direction of the locking plug; A sealing member, which is arranged at the rear of the locking plug and is enclosed with the housing to form a sealed space; A connecting pipeline, which is in communication with the sealed space; the other end of the connecting pipeline is used to connect to a storage element to provide hydraulic fluid into the sealed space; A reset elastic component, comprising an elastic body arranged inside the locking plug and a stopper arranged corresponding to the adjusting hole, wherein two ends of the elastic body respectively abut against the locking plug and the front end of the stopper, and the rear end of the stopper extends through the adjusting hole and cannot move axially due to the limitation of the housing; Wherein, the locking plug moves toward the front end under the pressure of the hydraulic fluid and abuts against the riser suspension head to realize the locking function. When the hydraulic fluid flows out of the sealing space, the elastic body resets and drives the locking plug to move toward the rear end.

2. The locking device according to claim 1, characterized in that: The sealing member comprises a sealing cylinder with a cylindrical structure and a sealing plate arranged at the front end of the sealing cylinder, the rear end of the sealing cylinder is closed and the front end is open, the sealing plate extends outwardly beyond the sealing cylinder, and the rear end of the locking plug can be located in the sealing cylinder; The outer shell includes a front shell and a rear cover arranged at the rear end of the front shell, the rear cover includes a cover body and a positioning tube, the front end of the cover body is provided with a first docking ring protruding outward, the rear end of the positioning tube is provided with a second docking ring, the second docking ring is docked with the first docking ring, the sealing plate is arranged between the first docking ring and the second docking ring, and the sealing component and the cover body enclose the sealed space.

3. The locking device according to claim 2, characterized in that: An extension portion is integrally extended outward from the outer circumference of the sealing cylinder, and the extension portion is in a corrugated shape; The extension portion includes at least two wave peak portions which are spaced apart from each other.

4. The locking device according to claim 2, characterized in that: The sealing member further comprises at least one sealing ring, and the sealing ring is arranged on the rear side of the sealing plate; The front end of the cover body is provided with at least one sealing groove, the sealing groove and the sealing ring are arranged one by one, the opening of the sealing groove faces forward, and the sealing ring is clamped in the corresponding sealing groove; The cross section of the sealing ring is semicircular, with its protrusion facing rearward, and the shape of the sealing groove is adapted to the shape of the sealing ring.

5. The locking device according to claim 1, characterized in that: The limiting member comprises a limiting plate and an abutting plate which are arranged in parallel and spaced apart from each other, and a transition plate connecting the limiting plate and the abutting plate, wherein the limiting plate and the abutting plate are arranged on both sides of the transition plate; A receiving groove is provided on the inner peripheral wall of the shell, the opening of the receiving groove is inward, the limiting plate is located in the receiving groove, the transition plate and the abutment plate are located inside the locking plug, and the abutment plate is used to abut against the front end of the elastic body.

6. The locking device according to claim 1, characterized in that: The resetting elastic component includes a bottom plate, which is arranged between the limiting member and the elastic body, and the outer periphery of the bottom plate is flush with the outer periphery of the front end of the elastic body or extends outwardly beyond the outer periphery of the front end of the elastic body.

7. The locking device according to claim 1, characterized in that: The shell includes a front shell and a rear cover arranged at the rear end of the front shell, the rear end of the rear cover is closed and the front end is open, both ends of the front shell are open, the front end of the rear cover extends into the front shell, a step is provided on the inner circumferential wall of the front shell, the front end of the rear cover and the step together enclose a receiving groove, the opening of the receiving groove is inward, and the receiving groove receives the portion of the limiting member extending out of the adjustment hole.

8. The locking device according to claim 7, characterized in that: The front shell includes a detachably connected connecting seat and a mounting seat arranged at the front end of the connecting seat, the connecting seat has openings at both ends, and the mounting seat has openings at both ends. The outer periphery of the connecting seat is provided with a first limiting boss protruding outward, and the mounting seat is provided with a second limiting boss protruding outward, and the first limiting boss cooperates with the second limiting boss to form a limiting space.

9. The locking device according to claim 8, characterized in that: The connecting seat comprises a first barrel section and a second barrel section located at the rear end of the first barrel section, the inner diameter of the second barrel section is larger than the inner diameter of the first barrel section, and the step is formed between the front end of the second barrel section and the rear end of the first barrel section; The first cylinder segment is provided with a plurality of first connecting holes, which are arranged at intervals along the circumference of the first cylinder segment, and the axes of the first connecting holes are parallel to the axes of the first cylinder segment, and the first connecting holes penetrate the first cylinder segment; the mounting seat is provided with a second connecting hole corresponding to the first connecting hole, and the second connecting hole is a blind hole, and fasteners are passed through the first connecting hole and the second connecting hole to realize a detachable connection between the connecting seat and the mounting seat.

10. The locking device according to claim 7, characterized in that: The rear cover comprises a cover body and a positioning tube, the rear end of the positioning tube is provided with a first docking ring, the front end of the cover body is provided with a second docking ring, and the first docking ring is docked with the second docking ring; A connecting ring protrudes outward from the rear end of the front shell, the connecting ring is closely connected to the front end of the second docking ring, and the positioning tube extends into the front shell; The first docking ring is detachably connected to the second docking ring, and the connecting ring is detachably connected to the second docking ring.

11. The locking device according to claim 1, characterized in that: The connecting pipeline is provided with a locking valve, and the locking valve is located outside the housing; The locking valve is in communication with a control component, and the control component is disposed on the platform.

12. The locking device according to claim 11, characterized in that: The locking device also includes a pressure detection component for detecting the real-time pressure in the sealed space. The pressure detection component is in communication connection with the locking valve. When the real-time pressure reaches a preset pressure value, the locking valve is closed.

13. A riser support system, characterized in that: It comprises a riser support device and a plurality of locking devices as claimed in any one of claims 1 to 12 arranged on the outer circumference of the riser support device, wherein the plurality of locking devices are evenly arranged along the circumference of the riser support device.

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