CN107701834A - A kind of sealing force adjustable water lower flange - Google Patents

Abstract

The invention relates to an underwater flange with adjustable sealing force, which is composed of a shell system, a holding system and a sealing system. system, the inner surfaces of the gripping system and the sealing system are in contact with the pipe. The working principle is: turn the nut to make the fastening bolt push the moving flange to move axially, and the moving flange moves axially to push the holding ring to shrink radially, and the holding ring shrinks radially to hold the pipe tightly; turn the top tightening bolt, The tightening bolt pushes the moving ring axially, and the moving ring moves axially to compress the sealing ring, and the sealing ring is compressed and deformed to seal the pipeline. Compared with the prior art, the present invention can independently adjust the radial holding force and sealing force of the pipeline, and can quickly install the flange on the underwater submarine pipeline, realize the rapid repair connection of the submarine pipeline, and shorten the repair period of the submarine pipeline , Reduce labor intensity, and reduce the overall cost of offshore oil and gas transportation.

Description

An adjustable sealing force underwater flange

technical field

The invention relates to the technical field of emergency repair equipment for oil and gas submarine pipelines, in particular to an underwater flange with adjustable sealing force.

Background technique

With the shortage of land oil and gas resources, the world's coastal countries have successively explored and exploited offshore oil and gas resources, and the exploration and exploitation of offshore oil and gas resources has gradually become the main trend of the development of the oil and gas industry at home and abroad. In addition, as my country's economy continues to grow rapidly, insufficient supply of oil and gas resources will become the main contradiction hindering economic development. In order to increase the possession of oil and gas resources, offshore oil and gas exploration and exploitation have become the strategic focus of my country's sustainable energy development.

Submarine pipelines undertake important tasks such as the output of underwater oil and gas wells, the transportation of subsea crude oil, natural gas and associated gas media, so the safe and stable operation of submarine pipelines is of great significance to the development and utilization of marine oil and gas resources. Due to the operating conditions of the seabed and the special environment of the surrounding seawater, the submarine pipeline has risks such as fatigue damage, geological disaster damage, corrosion damage, ship anchor damage, and third-party damage in marine exploration and development. Once a submarine pipeline leaks, it will not only damage the downstream and The normal production and life of end users will be adversely affected, and it will also cause marine environmental pollution, waste of oil and gas resources, and interruption of oil field production.

If the submarine pipeline is damaged or damaged during operation, it needs to be repaired or reinforced. At present, there are three main subsea pipeline repair technologies: pipe clamp plugging, composite material reinforcement and underwater pipe section replacement. Among them, the composite material reinforcement technology, such as injection of epoxy resin and other materials, is easy to cause impact damage to the pipe body of the submarine pipeline, and the injection machine equipment is complex and huge, and the on-site materials are self-made and the underwater operation process is complicated. It is not conducive to the rapid repair of submarine pipelines. The leak plugging and repair technology of pipe clamps adopts mechanical plugging, which has the advantages of simple implementation and short operation period. It can be used for pipeline leakage caused by corrosion, base metal defects, cracks and other reasons in the Bohai Sea area. However, once the submarine pipeline is severely damaged or When there is a large deformation and the submarine pipeline is in a deep or deep water area, it is difficult for this technology to achieve effective plugging and repair. Submarine pipeline section replacement and repair technology is characterized by a wide range of applications, and can complete various forms of submarine pipeline damage repairs such as corrosion or fracture; submarine pipeline section replacement is divided into: submarine pipeline welding replacement technology and submarine pipeline connector connection technology. However, the submarine pipeline welding replacement technology has many procedures, high environmental requirements, complex structure, and cannot achieve rapid replacement. Therefore, the replacement efficiency of the pipe section is not high, and the reliability of the connection is not ideal; the submarine pipeline connector technology can solve the above problems, but the disadvantages are The production of key spare parts such as mechanical connectors for repair and its repair operation equipment and operation process have always been in the hands of foreign professional companies, and there are few corresponding domestic equipment and technologies. In addition, at present, the equipment for subsea pipeline section replacement at home and abroad is mainly based on connectors. For example, patent number CN201620156196.8 discloses a new type of submarine pipeline connector, and patent number CN201510054118.7 discloses a submarine pipeline clamp repair connector. , Patent No. CN201621328659.0 discloses a submarine pipeline plugging device and a split submarine pipeline plugging fixture, and Patent No. CN201610319504.9 is an adjustable and partial submarine pipeline quick repair connection device. The medium sealing force of the above-mentioned device is determined by the pre-tightening force of the bolts, and the bolts not only need to radially hold the pipeline tightly, but also realize the connection between the flange end covers, so the sealing force cannot be adjusted independently; If the pre-tightening force of the bolts is too small, the sealing force will be too small and insufficient to cause leakage. If the pre-tightening force of the bolts is too large, the service life of the sealing system will be reduced. Therefore, it is urgent to design a device with independently adjustable radial holding force and sealing force.

Contents of the invention

In order to overcome the above-mentioned shortcomings of existing subsea pipe section replacement equipment, the purpose of the present invention is to provide an adjustable sealing force underwater flange, which can quickly install flanges for underwater subsea pipelines, and the sealing force, radial holding The tightening force can be adjusted independently, so as to realize the rapid repair connection of the submarine pipeline and shorten the repair period of the submarine pipeline.

In order to achieve the above object, the technical solution of the present invention is achieved in that:

An underwater flange with adjustable sealing force, which is composed of a shell system 1, a tightening system 2 and a sealing system 3, and is characterized in that: the movable flange 11 and the fixed flange 12 of the shell system 1 form a cavity, and the cavity A tightening system 2 is installed on the left side of the body, a sealing system 3 is installed on the right side of the cavity, and the inner surfaces of the tightening system 2 and the sealing system 3 are in contact with a pipe 4;

The clamping system 2 includes a movable flange 11 and a fixed flange 12; the movable flange 11 is in the shape of a hollow stepped shaft, and the left end surface of the large shaft is designed with evenly distributed regular hexagonal blind holes, and the regular hexagonal blind holes are installed with The bolt head of the fastening bolt 19, the bottom surface of the positive six-deformed blind hole is designed with a circular through hole, and the fastening bolt 19 passes through the circular through hole to make the movable flange 11 and the fixed flange 12 form a bolt fastening connection; regular hexagonal The inner side of the blind hole is designed with evenly distributed small through holes 17, and the polished rods of the tightening bolts 31 pass through the small through holes 17; the circumferential direction of the end faces of the small through holes 17 is designed with an annular groove 18, and the inner surface of the annular groove 18 is installed. There is a sealing ring, the sealing ring is in contact with the gasket 32, and the gasket 32 is pressed on the left end surface of the moving flange 11 by the jacking bolt 31; the right end surface of the large shaft of the moving flange 11 is designed with a small stepped shaft 13 and a small stepped shaft 13 The outer surface of the outer surface is in contact with the inner surface of the holding tube 21; the right side of the inner surface of the small stepped shaft 13 is designed with a tapered hole, and the inner surface of the tapered hole is in contact with the outer surface of the holding ring 22; the large shaft of the mobile flange 11 The right end surface is in contact with a fixed flange 12; the fixed flange 12 is in the shape of a hollow cylinder, and the left end surface of the fixed flange 12 is designed with an annular groove, and a sealing ring is installed in the annular groove; the middle part of the fixed flange 12 is designed with an outwardly extending There are evenly distributed through holes in the steps, and the fastening bolts 19 pass through the through holes so that the fixed flange 12 and the movable flange 11 form a bolted connection; the right end of the fixed flange 12 is designed with a flange , the end face of the flange is designed with a through hole for connecting the prefabricated flange pipe 5; the inner surface of the fixed flange 12 is designed with a large stepped hole 14, a middle stepped hole 15 and a small stepped hole 16, and the large stepped hole 14 is installed with Hold the system 2 tightly, the sealing system 3 is installed in the middle step hole 15, and the rubber gasket 34 is installed in the small step hole 16;

The clamping system 2 includes a clamping tube 21 and a clamping ring 22; the clamping tube 21 is cylindrical, and the left end surface of the clamping tube 21 is designed with a long through hole 23, and there is a jacking bolt 31 in the long through hole 23 Through, the right end surface of the long through hole 23 is designed with a threaded hole, the internal thread of the threaded hole and the external thread of the jacking bolt 31 interlock; the left end surface of the holding cylinder 21 is in contact with the movable flange 11, and the right end surface is in contact with the fixing method. Lan 12; the inner surface of the holding tube 21 is designed with a stepped hole, and the right end surface of the stepped hole is designed with a conical hole, and the inner surface of the tapered hole is in contact with the outer surface of the holding ring 22; the holding ring 22 has a rectangular gap 24 ring, the cross section of the ring is a right-angled isosceles triangle, and the inner surface of the tight ring is designed with an axial rectangular groove 25 and a circumferential triangular groove 26;

The sealing system 3 includes a tightening bolt 31, a gasket 32, a moving ring 33 and a rubber sealing ring 34; There is a sealing ring for pressing on the surface; the tightening bolt 31 passes through the small through hole 17 of the moving flange 11 and the long through hole 23 of the holding cylinder 21, and then the moving ring 33 is tightened; the moving ring 33 is in the shape of a ring, and the moving ring The right end face of 33 is designed with arc-shaped groove along the circumferential direction, and a sealing ring is installed in the circular groove, and the right side of the sealing ring is in contact with the end face of the middle stepped hole 15 of the fixed flange 12; the rubber gasket 34 is installed on In the gap between the end face of the pipe 4 and the small stepped hole 16 of the fixed flange 12 .

Compared with the prior art, the beneficial effects of the present invention are: (1) Quickly manufacture flanges for the replacement section of the submarine pipeline, thereby realizing quick connection of the replacement pipeline; (2) The sealing force of the device can be independently adjusted, and then Ensure the safety and reliability of the flange connection seal; (3) The radial clamping force of the device to the pipeline can also be adjusted independently, so that the adjustment of the radial clamping force is separated from the adjustment of the sealing force, ensuring that the device Radial tightness to pipelines; (4) The tightness and tightness system of the device is simple and easy to process and manufacture, thereby reducing the production and manufacturing costs of the device.

Description of drawings

Figure 1 is a cross-sectional plan view of the present invention.

Fig. 2 is a three-dimensional schematic diagram of the present invention.

Figure 3 is a three-dimensional sectional view of the present invention.

Fig. 4 is a three-dimensional plane sectional view of the present invention.

Figure 5 Three-dimensional cross-sectional view of the shell system.

Figure 6 is a three-dimensional plan view of the shell system.

Figure 7 is a three-dimensional cross-sectional view of the mobile flange.

Figure 8 is a three-dimensional sectional view of the fixed flange.

Fig. 9 is a three-dimensional sectional view of the clinging system.

Fig. 10 is a three-dimensional sectional view of the clasping cylinder.

Fig. 11 is a top view of the original state of the clasping ring.

Fig. 12 is a three-dimensional schematic diagram of the contracted clasping ring.

Fig. 13 is a partially enlarged view of the inner surface of the clasp ring.

Fig. 14 is a three-dimensional schematic diagram of the sealing system.

Fig. 15 is a three-dimensional schematic diagram of the moving ring.

Fig. 16 is a schematic plan view of the present invention after being connected to a prefabricated flange pipe.

1. Shell system, 2. Clamping system, 3. Sealing system, 4. Sleeve, 5. Prefabricated flange pipe; 11. Mobile flange, 12. Fixed flange, 13. Small stepped shaft, 14. Large Stepped hole, 15. Medium stepped hole, 16. Small stepped hole; 17. Small through hole, 18. Annular groove, 19. Fastening bolt; 21. Clamping tube, 22. Clamping ring, 23. Long through hole , 24. Gap, 25. Axial rectangular groove, 26. Annular triangular groove; 31. Top tightening bolt, 32. Gasket, 33. Moving ring, 34. Rubber gasket.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

Referring to Fig. 1~Fig. 3, Fig. 16, a connecting flange of an underwater pipeline 4 is composed of a shell system 1, a holding system 2 and a sealing system 3, and is characterized in that: the movable flange 11 of the shell system 1 and the The fixed flange 12 forms a cavity, the left side of the cavity is equipped with a tightening system 2, the right side of the cavity is equipped with a sealing system 3, and the inner surfaces of the tightening system 2 and the sealing system 3 are in contact with a pipe 4. Its working principle is: turn the nut to make the fastening bolt 19 push the moving flange 11 to move axially, the moving flange 11 moves axially to push the holding ring 22 to shrink radially, and the holding ring 22 shrinks radially to hold the pipe 4 ;Turn the jacking bolt 31, the jacking bolt 31 pushes the moving ring 33 axially, the moving ring 33 moves axially and then compresses the sealing ring, and the sealing ring is compressed and deformed to seal the pipeline 4; adjust the pre-tightening force of the tightening bolt The size can change the size of the holding force of the holding ring 22, adjust the size of the extension distance of the jacking bolt 31, can change the size of the sealing force, and the size of the holding force and the sealing force can be adjusted relatively independently.

Referring to Figures 4 to 7, the clamping system 2 includes a movable flange 11 and a fixed flange 12, and the clamping system 2 is used for the clamping system 2 and the sealing system 3, and is used for adjusting the clamping force and the sealing force. The moving flange 11 is used to seal the end face of the fixed flange 12 and provide axial driving force for the clasp ring 22 . The moving flange 11 is in the shape of a hollow stepped shaft, and the left end of the large shaft is designed with evenly distributed regular hexagonal blind holes, which are used to carry the counter torque of the bolts when the bolts are pre-tightened; The bolt head of fastening bolt 19, the bottom surface of positive six-deformation blind hole is designed with circular through hole, and fastening bolt 19 passes through circular through hole to make movable flange 11 and fixed flange 12 form bolt fastening connection. The inner side of the regular hexagonal blind hole is designed with evenly distributed small through holes 17, which are used to install the jacking bolts 31; the light rods of the jacking bolts 31 pass through the small through holes 17; An annular groove 18 is designed in the circumferential direction, and a sealing ring is installed in the annular groove 18. The sealing ring is in contact with the gasket 32, and the gasket 32 is pressed against the left end surface of the movable flange 11 by the jacking bolt 31, thereby preventing seawater from flowing from the top The gap between the tightening bolt 31 and the movable flange 11 enters the interior of the shell system 1 . The right end of the large shaft of the mobile flange 11 is designed with a small stepped shaft 13, the outer surface of the small stepped shaft 13 is in contact with the inner surface of the holding tube 21, so that the device can bear the load when the pipeline 4 is bent; the small stepped shaft 13 The right side of the inner surface is designed with a tapered hole, the inner surface of the tapered hole is in contact with the outer surface of the holding ring 22, due to the effect of the tapered hole, when the moving flange 11 moves axially, the holding ring 22 will shrink radially , so as to achieve the purpose of holding the pipe 4 tightly by the holding ring 22 . The right end face of the large shaft of the movable flange 11 is in contact with the fixed flange 12 .

Referring to FIG. 8 , the fixing flange 12 is used for installing the clamping system 2 and the sealing system 3 . The fixed flange 12 is in the shape of a hollow cylinder. The left end surface of the fixed flange 12 is designed with an annular groove, and a sealing ring is installed in the annular groove. The sealing ring is used to prevent seawater from entering the gap between the movable flange 11 and the fixed flange 12. into the housing system 1. The middle part of the fixed flange 12 is designed with an outwardly protruding step, and there are evenly distributed through holes in the step. The through holes are used for the fastening bolts 19 to pass through and make the fixed flange 12 and the movable flange 11 form a bolt fastening connect. The right end face of the fixed flange 12 is designed with a flange, and the end face of the flange is designed with a through hole for connecting the prefabricated flange pipe 5 . The inner surface of the fixed flange 12 is designed with a large stepped hole 14, a middle stepped hole 15 and a small stepped hole 16, the large stepped hole 14 is used to install the clamping system 2, the middle stepped hole 15 is used to install the sealing system 3, and the small stepped hole Holes 16 are used for mounting rubber gaskets 34 .

Referring to Figures 9 to 10, the tightening system 2 includes a tightening cylinder 21 and a tightening ring 22; the tightening system 2 is used to tighten the pipeline 4, thereby preventing the shell system 1 from moving freely. The clasping tube 21 is used for installing the clasping ring 22 and shrinking the clasping ring 22 radially so as to clasp the pipeline 4 . The holding cylinder 21 is cylindrical, and the left end surface of the holding cylinder 21 is designed with a long through hole 23, which is used to install the jacking bolt 31; the jacking bolt 31 passes through the long through hole 23, and the long through hole 23 The right end surface of the hole 23 is designed with a threaded hole, the internal thread of the threaded hole and the external thread of the jacking bolt 31 interlock, so that the jacking bolt 31 and the holding cylinder 21 form a threaded connection, when the jacking bolt 31 is screwed, The tightening bolt 31 enters and protrudes from the clamping cylinder 21 , so that the tightening bolt 31 tightens the moving ring 33 , and different sealing forces can be obtained with different extension distances of the tightening bolt 31 . The left end surface of the holding cylinder 21 is in contact with the movable flange 11 , and the right end surface is in contact with the fixed flange 12 , thereby limiting the axial movement of the holding cylinder 21 . The inner surface of the holding cylinder 21 is designed with a stepped hole, and the right end surface of the stepped hole is designed with a conical hole. The inner surface of the tapered hole and the outer surface of the holding ring 22 are in contact with each other. When the moving flange 11 pushes the holding ring 22 to move axially At this time, the holding ring 22 on the right side will shrink radially due to the effect of the conical hole, so that the holding ring 22 can radially hold the pipe 4 tightly.

Referring to Figures 11 to 13, the holding ring 22 is deformed and shrunk to hold the pipeline 4 tightly; the holding ring 22 is a circular ring with a rectangular gap 24, and the outer diameter of the circular ring is larger than that of the tapered hole of the movable flange 11 diameter and the diameter of the tapered hole of the clamping cylinder 21, when the moving flange 11 pushes the clamping ring 22 to move axially, the clamping ring 22 will be deformed under the action of the cone surface and the gap 24, so that the inside and outside of the clamping ring 22 The diameter is reduced so as to hold the pipe 4 tightly. The cross-section of the ring is a right-angled isosceles triangle, and the inner surface of the tight ring is designed with an axial rectangular groove 25 and a circumferential triangular groove 26. The rectangular groove and the triangular groove are used to increase the holding ring 22 Clamping force on pipe 4.

Referring to Figures 14-15, the sealing system 3 includes jacking bolts 31, gaskets 32, moving rings 33 and rubber sealing rings 34; the sealing system 3 is used to seal the gap between the pipeline 4 and the device, thereby preventing oil and gas leakage. In addition, The sealing system 3 can also be used to adjust the size of the sealing force. The gasket 32 is installed between the jacking bolt 31 and the left end surface of the movable flange 11, and the right end surface of the gasket 32 is pressed with a sealing ring. The gap of the gap enters the interior of the housing system 1 . The tightening bolt 31 passes through the small through hole 17 of the moving flange 11 and the long through hole 23 of the holding cylinder 21, and then tightens the moving ring 33. Adjust the distance between the tightening bolt 31 and the holding cylinder 21 to adjust the sealing ring of sealing force. The moving ring 33 is in the shape of a ring, and the right end surface of the moving ring 33 is designed with an arc-shaped groove along the circumference, and the ring-shaped groove is used for installing the sealing ring; 15 end face contact, thus forming a second seal. The rubber gasket 34 is installed in the gap between the end surface of the pipe 4 and the small stepped hole 16 of the fixed flange 12, thereby forming the first seal.

Referring to Fig. 16, compared with the prior art, the present invention can independently adjust the radial holding force and sealing force of the pipeline 4, and can quickly install flanges on the underwater pipeline 4 to realize the rapid repair connection of the submarine pipeline 4 , thereby shortening the repair period of the submarine pipeline 4, reducing labor intensity, and reducing the overall cost of offshore oil and gas transportation.

Claims (1)

1. A kind of 1. sealing force adjustable water lower flange, by housing system（1）, hold system tightly（2）And sealing system（3）Form, its It is characterized as：Housing system（1）Rotary flange（11）And mounting flange（12）Cavity is formed, holding system is installed on the left of cavity System（2）, sealing system is installed on the right side of cavity（3）, hold system tightly（2）And sealing system（3）Inner surface contact have pipeline （4）；

   The holding system（2）Including rotary flange（11）And mounting flange（12）；Rotary flange（11）In hollow ladder shaft-like, Big axle left side is designed with uniform regular hexagon blind hole, and fastening bolt is provided with regular hexagon blind hole（19）Bolt head, The floor design of positive six deformations blind hole has manhole, fastening bolt（19）Make rotary flange through manhole（11）And fixation Flange（12）Bolt is formed to be fastenedly connected；Uniform small through hole is designed with the inside of regular hexagon blind hole（17）, small through hole（17） Inside there is puller bolt（31）Polished rod pass through；Small through hole（17）The circumference of end face is designed with ring-shaped groove（18）, ring-shaped groove （18）Sealing ring, sealing ring and pad are inside installed（32）Contact, pad（32）By puller bolt（31）It is pressed in rotary flange （11）Left side；Rotary flange（11）Big axle right side be designed with small multi-diameter shaft（13）, small multi-diameter shaft（13）Outer surface with Hold cylinder tightly（21）Inner surface contact；Small multi-diameter shaft（13）Inner surface on the right side of be designed with bellmouth, taper internal surface of hole is with embracing Tight ring（22）Outer surface contact；Rotary flange（11）Big axle right side contact have mounting flange（12）；Mounting flange（12） In hollow cylindrical, mounting flange（12）Left side be designed with annular groove, sealing ring is installed in annular groove；Mounting flange （12）Middle part be designed with outwardly directed step, uniform through hole, fastening bolt are designed with step（19）Make through through hole Mounting flange（12）With rotary flange（11）Bolt is formed to be fastenedly connected；Mounting flange（12）Right side be designed with ring flange, Flange side surface is designed with for connecting prefabricated flange pipe（5）Through hole；Mounting flange（12）Inner surface to be designed with meter big Shoulder hole（14）, middle shoulder hole（15）With small shoulder hole（16）, big shoulder hole（14）Holding system is inside installed（2）, middle ladder Hole（15）Sealing system is inside installed（3）, small shoulder hole（16）Rubber sheet gasket is inside installed（34）；

   The holding system（2）Including holding cylinder tightly（21）And hold-fast ring（22）；Hold cylinder tightly（21）It is cylindrical, hold cylinder tightly（21）'s Left side is designed with long through-hole（23）, long through-hole（23）Inside there is puller bolt（31）Pass through, long through-hole（23）Right side design There are screwed hole, the internal thread and puller bolt of screwed hole（31）External screw thread be mutually twisted；Hold cylinder tightly（21）Left side and shifting Dynamic flange（11）Contact, right side and mounting flange（12）'s；Hold cylinder tightly（21）Inner surface is designed with shoulder hole, the right side of shoulder hole End face is designed with conical bore, the inner surface and hold-fast ring of conical bore（22）Outer surface contact with each other；Hold-fast ring（22）To be provided with Rectangular indentation（24）Annulus, the cross section of annulus is right angled isosceles triangle, hold tightly footpath ring inner surface be designed with it is axial Rectangle groove（25）With the triangular groove of ring（26）；

   The sealing system（3）Including puller bolt（31）, pad（32）, shift(ing) ring（33）With rubber gasket piece（34）；It is described Pad（32）It is installed on puller bolt（31）With rotary flange（11）Between left side, pad（32）Right side compress have sealing Circle；Puller bolt（31）Through rotary flange（11）Small through hole（17）With holding cylinder tightly（21）Long through-hole（23）After held out against shifting Rotating ring（33）；Shift(ing) ring（33）In annular shape, shift(ing) ring（33）Right side be circumferentially designed with circular groove, annular is recessed Sealing ring, the right side of sealing ring and mounting flange are installed in groove（12）Middle shoulder hole（15）End contact；Rubber sheet gasket （32）It is installed on pipeline（4）End face and mounting flange（12）Small shoulder hole（16）Between gap in.