CN210165075U

CN210165075U - Sealing device for submarine pipeline maintenance pipe clamp

Info

Publication number: CN210165075U
Application number: CN201920815592.0U
Authority: CN
Inventors: 叶永彪; 原庆东; 冒家友; 张西伟; 曹晨磊; 李龙祥; 邱辉武
Original assignee: China National Offshore Oil Corp CNOOC; CNOOC Deepwater Development Ltd
Current assignee: China National Offshore Oil Corp CNOOC; CNOOC Deepwater Development Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2020-03-20
Anticipated expiration: 2029-05-31

Abstract

The utility model relates to a sealing device for a submarine pipeline maintenance pipe clamp, which comprises a shell, a locking structure and a sealing structure; the housing comprises a first housing and a second housing; the sealing structure comprises a first axial sealing strip and a second axial sealing strip which are arranged in the shell along the axial direction of the shell, first radial sealing rings which are respectively arranged at two ends of the first axial sealing strip along the radial direction of the shell, and second radial sealing rings which are respectively arranged at two ends of the second axial sealing strip along the radial direction of the shell; the axial length of the first axial sealing strip is greater than that of the second axial sealing strip, and the first radial sealing ring and the second radial sealing ring respectively comprise a first half part arranged in the first shell and a second half part arranged in the second shell; the locking structures are respectively arranged at two ends of the shell to push the first radial sealing ring and the second radial sealing ring to respectively abut against the first axial sealing strip and the second axial sealing strip.

Description

Sealing device for submarine pipeline maintenance pipe clamp

Technical Field

The utility model relates to an offshore oil development field, more specifically say, relate to a sealing device for submarine pipeline maintenance pipe strap.

Background

The submarine oil and gas pipeline maintenance pipe clamp is applied to leakage stoppage maintenance of a marine pipe, does not need welding in the installation and operation process, has the advantages of simplicity and convenience in operation, rapidness in repair, lower repair cost and the like, and is widely applied to the field of emergency maintenance of the marine pipe with local damage or leakage.

The emergency maintenance pipe clamp for the sea pipe is generally designed in a two-piece type openable mode, a diver or an underwater Robot (ROV) uses a bolt to install and fix the emergency maintenance pipe clamp to the outside of a pipeline to be maintained, a sealing system forms a closed annular space capable of bearing preset pressure between the pipe clamp and the pipeline, and meanwhile the pipe clamp strengthens the structural strength of the pipeline, so that the purposes of plugging and repairing the pipeline are achieved.

The sealing device is a key component device of a marine pipeline maintenance pipe clamp, and directly determines the success or failure of the maintenance and the first-aid repair of the submarine pipeline. Therefore, the development of the sealing device matched with the submarine oil and gas pipeline maintenance pipe clamp has important significance for guaranteeing the safe production of oil and gas fields.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a sealing device for submarine pipeline maintenance pipe strap is provided, and sealing pressure is big, and sealing performance is good, and the reliability is high.

The utility model provides a technical scheme that its technical problem adopted is: constructing a sealing device for a submarine pipeline maintenance pipe clamp, which comprises a shell, a locking structure and a sealing structure;

the shell comprises a first shell and a second shell which are matched and installed with each other;

the sealing structure comprises a first axial sealing strip and a second axial sealing strip which are arranged in the shell along the axial direction of the shell, first radial sealing strips which are respectively arranged at two ends of the first axial sealing strip along the radial direction of the shell, and second radial sealing strips which are respectively arranged at two ends of the second axial sealing strip along the radial direction of the shell;

the axial length of the first axial sealing strip is greater than that of the second axial sealing strip, and the first radial sealing ring and the second radial sealing ring respectively comprise a first half part arranged in the first shell and a second half part arranged in the second shell;

the locking structures are respectively arranged at two ends of the shell to push the first radial sealing ring and the second radial sealing ring to respectively abut against the first axial sealing strip and the second axial sealing strip.

In some embodiments, a first attaching surface attached to the second housing is disposed on the first housing, a second attaching surface attached to the first housing is disposed on the second housing, and a first groove and a second groove, which are used for placing the first axial sealing strip and the second axial sealing strip and are not communicated with each other, are respectively disposed on the first attaching surface.

In some embodiments, the second axial sealing strip is a straight strip, and the first axial sealing strip protrudes radially outward to form a bent portion corresponding to the position of the second axial sealing strip.

In some embodiments, the cross sections of the first and second axial sealing strips are circular, the first and second grooves are square grooves, and the cross sectional area of the square grooves is slightly larger than that of the first and second axial sealing strips.

In some embodiments, the first axial sealing strip, the second axial sealing strip, the first radial sealing ring and the second radial sealing ring are made of fluororubber materials.

In some embodiments, the intersection of the first half and the second half is provided with interengaging teeth.

In some embodiments, the seal structure further comprises a seal testing assembly including an operation panel provided on the housing, and an oil inlet pipe connected to the operation panel;

and a sealing middle cavity is formed among the first axial sealing strip, the second axial sealing strip, the first radial sealing ring and the second radial sealing ring, and an oil outlet of the oil inlet pipe is communicated with the sealing middle cavity.

In some embodiments, the locking structure includes a flange disposed outside an end surface of the housing, a slip sleeve coupled to the flange and extending axially into the housing, slips fitted to an inner sidewall of the slip sleeve, a push rod disposed at an end of the slip sleeve remote from the flange, and a radial fastening assembly securing the flange and the housing;

the sealing device further comprises an axial fastening assembly for fixing the first shell and the second shell, wherein the axial fastening assembly is perpendicular to the radial fastening assembly.

In some embodiments, the locking structure further comprises a radial seal compression ring disposed between the push rod and the first radial seal ring, a radial seal slip ring disposed between the first radial seal ring and the second radial seal ring, and a radial seal retainer ring disposed at an end of the second radial seal ring remote from the first radial seal ring.

In some embodiments, the locking structure includes radial seal limiting rings, and the first radial seal ring and the second radial seal ring are respectively clamped between every two radial seal limiting rings; the cross-section of radial seal spacing ring is the L type, the radial seal spacing ring orientation one side of first axial sealing strip, second axial sealing strip has the opening.

Implement the utility model discloses following beneficial effect has at least: the utility model discloses a sealing device for submarine pipeline maintenance pipe strap, the both ends of first axial seal strip respectively with first radial seal ring in close contact with, form the first layer seal structure that is located the skin; the two ends of the second axial sealing strip are respectively in close contact with the second radial sealing ring to form a second layer sealing structure positioned on the inner layer, and the double-layer sealing has the advantages of good sealing performance, high sealing reliability, large sealing pressure and the like, and is particularly suitable for the submarine pipeline maintenance pipe clamp in a deep water area. After the installation is finished, a sealing middle cavity is formed among the first axial sealing strip, the second axial sealing strip, the first radial sealing ring and the second radial sealing ring, and the sealing device can be successfully installed through pressure testing in the sealing middle cavity.

Drawings

The invention will be further explained with reference to the drawings and examples, wherein:

fig. 1 is a schematic structural view of a subsea pipeline service pipe clamp according to some embodiments of the present invention;

fig. 2 is a schematic structural view of a seal structure in some embodiments of the present invention;

FIG. 3 is a schematic illustration of mating first and second halves of first and second radial seal rings in some embodiments of the present invention;

FIG. 4 is an exploded view of the first and second axial seal strips in some embodiments of the present invention;

fig. 5 is a schematic structural view of a subsea pipeline service pipe clamp first housing in accordance with some embodiments of the present invention;

fig. 6 is a schematic structural view of a second housing of a subsea pipeline maintenance clamp in accordance with some embodiments of the present invention;

fig. 7 is a schematic view of the structure of the flange, the slip cover and the push rod according to some embodiments of the present invention.

Detailed Description

In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in fig. 1-7, the sealing device for a subsea pipeline maintenance pipe clamp in some embodiments of the present invention may include a housing, a locking structure, and a sealing structure. Wherein, the casing can include first casing 21 and second casing 22 of mutually supporting the installation, and first casing 21 and second casing 22 can splice and form the structure that opens and shuts to be convenient for install outside sea pipe 1. The seal structure may include two parts, an axial seal system and a radial seal system. The axial sealing system seals along the axial length direction of the sea pipe 1, and may include a first axial sealing strip 41 and a second axial sealing strip 42 arranged in the casing along the axial direction of the casing, and the axial lengths of the first axial sealing strip 41 and the second axial sealing strip 42 are different. The radial sealing system seals in the radial direction of the marine pipe 1, and may include first radial sealing rings 31 respectively disposed at both ends of the first axial sealing strip 41 in the radial direction of the casing, and second radial sealing rings 32 respectively disposed at both ends of the second axial sealing strip 42 in the radial direction of the casing. The first axial seal strip 41, the second axial seal strip 42, the first radial seal ring 31 and the second radial seal ring 32 can be made of flexible materials such as rubber and can elastically deform under the action of external force. The locking structures are respectively arranged at two ends of the shell to push the first radial sealing ring 31 and the second radial sealing ring 32 to respectively abut against the first axial sealing strip 41 and the second axial sealing strip 42, so that sealing is realized.

In the embodiment of the present invention, the axial length of the first axial seal strip 41 is greater than the axial length of the second axial seal strip 42. The number of the first axial sealing strip 41, the second axial sealing strip 42, the first radial sealing ring 31 and the second radial sealing ring 32 is two, that is, the axial sealing system and the radial sealing system are both of a double-layer sealing design. Two ends of the two first axial sealing strips 41 are respectively in close contact with the two first radial sealing rings 31 to form a first layer of sealing structure positioned on the outer layer; two ends of the two second axial seal strips 42 are respectively in close contact with the two second radial seal rings 32 to form a second layer of seal structure located at the inner layer. The double-layer sealing design has the advantages of good sealing performance, high sealing reliability, large sealing pressure and the like. After the installation is completed, a sealing middle cavity 34 is formed among the first axial sealing strip 41, the second axial sealing strip 42, the first radial sealing ring 31 and the second radial sealing ring 32, and the successful installation of the sealing system can be ensured by performing a pressure test in the sealing middle cavity 34.

As shown in fig. 1, 5, and 6, in the present embodiment, the outer cross sections of the first casing 21 and the second casing 22 are both square. The first and

second housings

21 and 22 may be made of metal such as stainless steel. The first housing 21 may further include a semicircular first catching groove 214, which may be formed by recessing a sidewall of the first housing 21 facing the second housing 22. The second housing 22 may further include a semicircular second catching groove 224, which may be formed by recessing a side wall of the second housing 22 facing the first housing 21. The first catching groove 214 and the second catching groove 224 are fitted to each other to form a circular cavity so as to be caught at the outside of the sea pipe 1.

The first casing 21 may further have a first attaching surface 213 attached to the second casing 22, and the first attaching surface 213 may include planes respectively located at two sides of the first engaging groove 214. The second casing 22 may further have a second attaching surface 223 attached to the first casing 21, and the second attaching surface 223 may include two planes respectively located at two sides of the second engaging groove 224. The first contact surface 213 and the second contact surface 223 are in contact with each other when the first casing 21 and the second casing 22 are joined to each other.

In some embodiments, the sealing device may further comprise an axial fastening assembly 8 for fixing the first and

second housings

21, 22 while compressively activating the first and second

axial sealing strips

41, 42. The axial fastening assembly 8 may be disposed along the opening and closing direction of the first and

second housings

21 and 22. The axial fastening assembly 8 may include a plurality of axial fastening bolts, which may be uniformly distributed along the upper and lower rows of the housing, and each row of the axial fastening bolts is sequentially and uniformly spaced along the axial direction of the housing.

In some embodiments, the sealing apparatus may further include a positioning structure which positions the first and

second housings

21 and 22 before a diver or an ROV (underwater robot) operates while the seabed is placed under the subsea pipeline maintenance clamp. The positioning structure may include positioning brackets 25 respectively installed at both axial ends of the housing, and a connecting rod 26 connecting the two positioning brackets 25. The positioning bracket 25 can be provided with a shackle 24 for offshore hoisting and lowering of the subsea pipeline maintenance pipe clamp. The connecting rod 26 is disposed along the axial direction of the housing with both ends thereof respectively protruding outside the housing. The first and

second housings

21 and 22 are rotatable about the connecting rod 26 to close or open the first and

second housings

21 and 22.

As shown in fig. 2-6, each of the first and second radial seal rings 31, 32 may include a first half 311 disposed in the first casing 21 and a second half 312 disposed in the second casing 22. The first half portion 311 is fitted on the inner sidewall of the first engaging groove 214, and the second half portion 312 is fitted on the inner sidewall of the second engaging groove 224. The first half part 311 and the second half part 312 may both be substantially semicircular structures, and after the first casing 21 and the second casing 22 are closed, the first half part 311 and the second half part 312 are mutually spliced to form a complete circular ring-shaped sealing ring, which is tightly attached to the outside of the marine pipe 1 to seal the marine pipe 1. Further, the joint of the first half 311 and the second half 312 may be provided with a tooth-like structure engaged with each other, so as to increase the contact area when the first half 311 and the second half 312 are engaged, so that the first half 311 and the second half 312 are tightly engaged with each other under the action of pressure, thereby improving the reliability of the radial seal.

In this embodiment, the first half portion 311 of the first radial seal ring 31 and the first half portion 311 of the second radial seal ring 32 have the same structure, and two ends of the respective first half portion 311 are respectively provided with a tooth-shaped protrusion. The second half 312 of the first radial seal ring 31 and the second half 312 of the second radial seal ring 32 have the same structure, and both ends of the respective second half 312 are respectively provided with a tooth-shaped groove. The toothed groove of the second half 312 and the toothed projection of the first half 311 engage each other. In other embodiments, the two ends of the first half 311 and the second half 312 may also be respectively provided with a plurality of tooth-shaped protrusions and a plurality of tooth-shaped grooves.

In other embodiments, the first half 311 of the first radial seal ring 31 may be configured differently than the first half 311 of the second radial seal ring 32, and the second half 312 of the first radial seal ring 31 may be configured differently than the second half 312 of the second radial seal ring 32.

In the present embodiment, two first axial seal strips 41, and two second axial seal strips 42 may be provided in the first housing 21. The first housing 21 is provided with a first groove 211 and a second groove 212 for mounting the first axial seal strip 41 and the second axial seal strip 42, respectively, and the first groove 211 and the second groove 212 are not communicated with each other. Specifically, the first groove 211 and the second groove 212 may be both disposed on the first attachment surface 213, and a distance between the second groove 212 and the central axis of the housing is smaller than a distance between the first groove 211 and the central axis of the housing. The second axial seal strip 42 may be straight; the first axial weather strip 41 is formed with a bent portion 411 protruding radially outward at a position corresponding to the second axial weather strip 42 to provide a mounting space for the second axial weather strip 42.

The second abutting surface 223 is a smooth plane corresponding to the positions of the first axial sealing strip 41 and the second axial sealing strip 42. When the first and

second housings

21 and 22 are closed and tightly attached by the axial fastening assembly 8, the first and second axial seal strips 41 and 42 may be elastically deformed by the pressing of the second abutting surface 223, so as to be squeezed into the closed space formed by the second abutting surface 223 and the first and

second grooves

211 and 212.

The cross-sectional areas of the first groove 211 and the second groove 212 can be slightly larger than the cross-sectional areas of the first axial sealing strip 41 and the second axial sealing strip 42 respectively, so that the edge of the axial sealing strip is prevented from overflowing due to interference fit.

Further, the cross sections of the first axial seal 41 and the second axial seal 42 may be circular, and the first groove 211 and the second groove 212 may be square grooves. The circular axial sealing strip can closely attach to the inner wall of the square groove after being pressed, sealing pressure can be generated in the square groove more easily, and sealing hardness is high. In addition, the circular axial sealing strip has the characteristic of self-reinforcement, and under the action of external pressure, the contact pressure between the axial sealing strip and the surface of the shell and the surface of the sea pipe 1 is increased along with the circular axial sealing strip, so that the sealing requirement is met. It is understood that in other embodiments, the cross-sections of the first axial seal 41, the second axial seal 42, the first groove 211 and the second groove 212 may have other shapes.

The axial two ends of the first groove 211 and the second groove 212 are respectively provided with an opening communicated with the first clamping groove 214 and the second clamping groove 224, so that the first axial sealing strip 41 and the second axial sealing strip 42 are respectively contacted with the first radial sealing ring 31 and the second radial sealing ring 32 at the positions to realize sealing.

In other embodiments, the first axial sealing strip 41 and the second axial sealing strip 42 may be both disposed in the second casing 22, or the first axial sealing strip 41 and the second axial sealing strip 42 may be disposed in the first casing 21 and the second casing 22, respectively.

In general, the material of the seal structure is required to have good physical and mechanical properties (elastic strength, hardness, abrasion resistance, compression resistance, tear resistance, etc.), low temperature resistance, heat resistance, gas impermeability, and chemical stability (oil resistance, acid resistance, water resistance, etc.). The utility model discloses in, first axial seal strip 41, second axial seal strip 42, first radial seal circle 31, second radial seal circle 32 all adopt the fluororubber material of higher hardness to make.

As shown in fig. 5-7, the locking structure may include a flange 61, a slip bowl 62, slips 63, a push rod 64, a radial tightening assembly 69, a radial seal compression ring 65, a radial seal slip ring 66, a radial seal retainer ring 67, and a radial seal retainer ring 68. The flange 61, the slip sleeve 62, the slip 63, the radial seal compression ring 65, the radial seal slip ring 66, the radial seal limiting ring 67, and the radial seal retainer ring 68 may each include a first semicircular ring portion installed on the first casing 21 and a second semicircular ring portion installed on the second casing 22, and after the first casing 21 and the second casing 22 are closed, each form a complete circular ring structure to be clamped outside the marine pipe 1. The flange 61, the slip sleeve 62, the slip 63, the push rod 64, the radial sealing compression ring 65, the radial sealing slip ring 66, the radial sealing stop ring 68 and the radial fastening assembly 69 can be made of metal materials such as stainless steel.

The flanges 61 are respectively arranged outside the end faces of the two ends of the shell, and the flanges 61 are fixedly connected with the end faces of the shell through radial fastening assemblies 69. The radial fastening components 69 may be arranged in the axial direction of the housing, which may be arranged perpendicular to the axial fastening components 8. The radial fastening assembly 69 may include a plurality of radial fastening bolts that are evenly spaced along the circumference of the flange 61. The radial fastening assembly 69 can be used for activating the first radial sealing ring 31 and the second radial sealing ring 32, when the flange 61 pushes and presses the first radial sealing ring 31 and the second radial sealing ring 32 under the action of the radial fastening assembly 69, the first radial sealing ring 31 and the second radial sealing ring 32 are in pressing contact with the first axial sealing strip 41 and the second axial sealing strip 42 along the radial direction of the sea pipe, and sealing at a designed sealing pressure is realized at the intersection of the first axial sealing strip 41 and the second axial sealing strip 42 and the first radial sealing ring 31 and the second radial sealing ring 32.

The slip sleeve 62 is connected to the flange 61 and extends into the housing along the axial direction, and it can be attached to the inner side walls of the first and

second snap grooves

214 and 224. Further, the slip sleeve 62 and the flange 61 may be of a unitary structure. Slips 63 are fittingly mounted on the inner side walls of the slip bowl 62, which grip the outer wall of the sea pipe 1 under the push of the slip bowl 62. The inner side wall of the slip sleeve 62 and the outer side wall of the slip 63 are respectively provided with at least one first grasping tooth 621 and at least one second grasping tooth 631, and the first grasping tooth 621 and the second grasping tooth 631 are mutually matched. Further, the inner wall surface of the first grasping tooth 621 and the outer wall surface of the second grasping tooth 631 are tapered surfaces, and the diameter of the tapered surfaces gradually increases from one end toward the flange 61 to one end away from the flange 61. The conical surface of the inner wall surface of the first grasping tooth 621 and the conical surface of the outer wall surface of the second grasping tooth 631 are matched with each other, and through contact drive between the conical surfaces, when the slip 63 is pushed, the slip sleeve 62 is pushed to move towards the center of the shell along the radial direction, so that the sea pipe 1 is grasped, and meanwhile, the centering operation of the pipe clamp is realized. The inner side walls of the slips 63 may also be provided with third gripping teeth 632 to facilitate gripping of the outer wall of the marine pipe 1. A push rod 64 is arranged at the end of the slip sleeve 62 remote from the flange 61, which may be arranged in the axial direction of the housing. The push rods 64 may be one or more and may be evenly spaced along the circumference of the slip cover 62.

The radial sealing compression ring 65 is arranged between the push rod 64 and the first radial sealing ring 31, the radial sealing sliding ring 66 is arranged between the first radial sealing ring 31 and the second radial sealing ring 32, and the radial sealing baffle ring 68 is arranged at one end of the second radial sealing ring 32 far away from the first radial sealing ring 31. The radial sealing compression ring 65, the radial sealing slip ring 66 and the radial sealing baffle ring 68 can be attached to the inner side walls of the first clamping groove 214 and the second clamping groove 224. The first and second clamping

grooves

214 and 224 are formed with steps corresponding to the radial seal retainer ring 68, and the radial seal retainer ring 68 abuts against the steps. Under the action of the radial fastening assembly 69, the flanges 61 at the two ends of the housing push the radial sealing compression ring 65 and the radial sealing sliding ring 66 through the push rods 64, so as to press the first radial sealing ring 31 and the second radial sealing ring 32. The first radial sealing ring 31 and the second radial sealing ring 32 deform to tightly abut against the outer wall of the sea pipe under the action of extrusion force along the axial direction of the sea pipe, so that contact pressure is generated, and sealing is realized.

Radial sealing limiting rings 67 can be further arranged on the two axial sides of the first radial sealing ring 31 and the second radial sealing ring 32, and the first radial sealing ring 31 and the second radial sealing ring 32 are respectively clamped between every two radial sealing limiting rings 67. The radial seal limiting ring 67 is used for limiting the positions of the first radial seal ring 31 and the second radial seal ring 32, and guiding the first radial seal ring 31 and the second radial seal ring 32 to deform radially when being compressed, so as to seal off the radial gap between the casing and the marine pipe 1. The radial sealing limiting ring 67 can be attached to the inner side walls of the first clamping groove 214 and the second clamping groove 224 and can be made of metal materials such as stainless steel. The cross section of the radial seal limiting ring 67 may be L-shaped, and one side of the radial seal limiting ring facing the first axial seal strip 41 and the second axial seal strip 42 is provided with an opening, so that the first radial seal ring 31 and the second radial seal ring 32 can be tightly attached to the first axial seal strip 41 and the second axial seal strip 42. The utility model provides a locking structure, the structure is more nimble, is convenient for use in the casing of different length, and the mounted position of primary shaft sealing strip 41, secondary shaft sealing strip 42 is also more nimble, is convenient for satisfy the leaking stoppage demand of different sea pipes.

In other embodiments, the locking structure may be implemented by other structural means. For example, the locking structure may not be provided with the push rod 64 and the radial seal compression ring 65, and the slip 63 and/or the slip sleeve 62 directly push the first radial seal ring 31 and the second radial seal ring 32; the locking structure may not be provided with the radial sealing baffle ring 68, and the second radial sealing ring 32 directly abuts against the steps of the first clamping groove 214 and the second clamping groove 224.

In some embodiments, the sealing device for a subsea pipeline service pipe clamp may further comprise a seal testing assembly 7. The seal testing assembly 7 may be connected to, and operated by, an ROV.

The seal testing assembly 7 may include an operation panel 72 provided on the housing, and an oil inlet pipe 73 connected to the operation panel 72. The oil outlet of the oil inlet pipe 73 is communicated with the sealing middle cavity 34 in the sealing structure, and after the sealing structure is installed, the oil inlet pipe 73 can be used for performing pressure test on the sealing middle cavity 34, so that whether the sealing system meets the design requirement or not can be tested. The operation panel 72 may be provided on an outer wall of the first housing 21. The operation panel 72 includes pressure detecting devices such as a pressure gauge and a pressure sensor, so as to test and display various data of the pressure test. An ROV interface may also be provided on the operation panel 72 to facilitate operation by connecting an ROV thereto.

The seal testing assembly 7 may also comprise at least one hydraulic cylinder 71. The telescopic direction of the hydraulic cylinder 71 is parallel to the opening and closing direction of the first shell 21 and the second shell 22, and the first shell 21 and the second shell 22 are driven to open and close through the telescopic motion of the hydraulic cylinder 71. In this embodiment, the seal testing assembly 7 may include two sets of hydraulic cylinders 71 respectively disposed at two axial ends of the housing, and each set of hydraulic cylinders 71 includes at least one hydraulic cylinder.

In some embodiments, the sealing device for the subsea pipeline service clamp may further comprise a sacrificial anode 23 disposed outside the housing for underwater corrosion protection of the subsea pipeline service clamp. The sacrificial anode 23 may be mounted on the outer wall of the first housing 21.

The utility model provides a sealing device's installation process for submarine pipeline maintenance pipe strap roughly as follows: after the subsea pipeline maintenance pipe clamp is lowered to a position, a diver or an ROV drives a hydraulic cylinder 71 through an operation panel 72, the first shell 21 and the second shell 22 rotate around the connecting rod 26, and the first shell 21 and the second shell 22 are closed; tightening the axial tightening assembly 8 to tighten the first and

second housings

21 and 22 together while compressively activating the first and second axial seal strips 41 and 42; tightening the radial tightening assembly 69 by the diver or ROV operation, pushing the slips 63 to grip the outer wall of the marine pipe 1, and simultaneously compressing and activating the first and second radial sealing rings 31, 32; finally, the oil inlet pipe 73 is used for carrying out pressure test on the sealing middle cavity 34, after the pressure is ensured not to be reduced for a period of time, the sealing system can be confirmed to meet the design requirement, and the installation process is finished.

The sealing device in the utility model is especially suitable for the submarine pipeline maintenance pipe clamp in deep water area, can be operated, installed and activated by divers or ROV, and has the advantages of high sealing reliability, simple and convenient activation process, good safety, low maintenance cost and the like; after activation is completed, a sealing pressure test can be carried out on a sealing middle cavity in the double-layer sealing system so as to ensure that the sealing system is successfully installed and activated; the sealing pressure is large, the maximum sealing pressure can reach more than 38MPa, and the sealing device has obvious advantages and wide application prospect. It is understood that the structure of the sealing device of the present invention includes but is not limited to a double-layer sealing system, and it can also be applied to three or more layers of sealing systems.

It is to be understood that the above-described respective technical features may be used in any combination without limitation.

The above examples only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. A sealing device for a submarine pipeline maintenance pipe clamp is characterized by comprising a shell, a locking structure and a sealing structure;

the shell comprises a first shell (21) and a second shell (22) which are matched and installed with each other;

the sealing structure comprises a first axial sealing strip (41) and a second axial sealing strip (42) which are arranged in the shell along the axial direction of the shell, first radial sealing rings (31) which are respectively arranged at two ends of the first axial sealing strip (41) along the radial direction of the shell, and second radial sealing rings (32) which are respectively arranged at two ends of the second axial sealing strip (42) along the radial direction of the shell;

the axial length of the first axial sealing strip (41) is greater than that of the second axial sealing strip (42), and the first radial sealing ring (31) and the second radial sealing ring (32) respectively comprise a first half part (311) arranged in the first shell (21) and a second half part (312) arranged in the second shell (22);

the locking structures are respectively arranged at two ends of the shell to push the first radial sealing ring (31) and the second radial sealing ring (32) to respectively abut against the first axial sealing strip (41) and the second axial sealing strip (42).

2. The sealing device for the subsea pipeline maintenance pipe clamp according to claim 1, wherein a first abutting surface (213) abutting against the second housing (22) is disposed on the first housing (21), a second abutting surface (223) abutting against the first housing (21) is disposed on the second housing (22), and a first groove (211) and a second groove (212) which are used for placing the first axial sealing strip (41) and the second axial sealing strip (42) and are not communicated with each other are respectively disposed on the first abutting surface (213).

3. The sealing device for the subsea pipe repair cartridge according to claim 2, wherein the second axial sealing strip (42) is a straight strip, and the first axial sealing strip (41) is formed with a bent portion (411) protruding radially outward at a position corresponding to the second axial sealing strip (42).

4. The sealing device for the subsea pipe maintenance pipe clamp according to claim 2, wherein the first axial sealing strip (41) and the second axial sealing strip (42) are circular in cross section, and the first groove (211) and the second groove (212) are square grooves having a cross-sectional area slightly larger than that of the first axial sealing strip (41) and the second axial sealing strip (42).

5. The sealing device for the subsea pipeline maintenance pipe clamp according to claim 1, wherein the first axial sealing strip (41), the second axial sealing strip (42), the first radial sealing ring (31), and the second radial sealing ring (32) are made of a fluororubber material.

6. Sealing device for subsea pipe repair cartridge according to claim 1, characterized in that the interface of the first half (311) and the second half (312) is provided with teeth engaging each other.

7. The sealing arrangement for subsea pipeline service pipe clamp according to claim 1, characterized in that the sealing arrangement further comprises a seal testing assembly (7), the seal testing assembly (7) comprising an operation panel (72) arranged on the housing, and an oil inlet pipe (73) connected to the operation panel (72);

a sealing middle cavity (34) is formed among the first axial sealing strip (41), the second axial sealing strip (42), the first radial sealing ring (31) and the second radial sealing ring (32), and an oil outlet of the oil inlet pipe (73) is communicated with the sealing middle cavity (34).

8. A sealing arrangement for a subsea pipeline service pipe clamp according to claim 1, characterized in that the locking structure comprises a flange (61) arranged outside the end face of the housing, a slip sleeve (62) connected to the flange (61) and extending axially into the housing, slips (63) fitted to the inner side walls of the slip sleeve (62), a push rod (64) arranged at the end of the slip sleeve (62) remote from the flange (61), and a radial fastening assembly (69) securing the flange (61) and the housing;

the sealing device further comprises an axial fastening assembly (8) for fixing the first housing (21) and the second housing (22), the axial fastening assembly (8) being perpendicular to the radial fastening assembly (69).

9. The sealing arrangement for a subsea pipe maintenance clamp according to claim 8, characterized in that the locking structure further comprises a radial seal compression ring (65) arranged between the push rod (64) and the first radial seal ring (31), a radial seal slide ring (66) arranged between the first radial seal ring (31) and the second radial seal ring (32), and a radial seal stop ring (68) arranged at an end of the second radial seal ring (32) remote from the first radial seal ring (31).

10. The sealing device for the subsea pipeline maintenance pipe clamp according to claim 1, wherein the locking structure comprises radial seal limiting rings (67), and the first radial seal ring (31) and the second radial seal ring (32) are respectively clamped between every two radial seal limiting rings (67); the cross section of radial seal spacing ring (67) is the L type, radial seal spacing ring (67) orientation one side of first axial sealing strip (41), second axial sealing strip (42) has the opening.