Plugging device for underwater maintenance and replacement of kingston valve and underwater maintenance and replacement method

Abstract

The invention discloses a plugging device for underwater maintenance and replacement of a kingston valve and an underwater maintenance and replacement method.The plugging device comprises a sealing cover, a centering pipe fitting, a plurality of switch type magnetic bases, a tightness inspection valve, a ventilation valve and a ventilation hose, and the centering pipe fitting is arranged in the center of the interior of the sealing cover; a plurality of switch type magnetic bases are evenly distributed on the sealing cover and located on the periphery of the centering pipe fitting in the circumferential direction, a tightness testing valve and a ventilation valve are arranged on the sealing cover and located above the centering pipe fitting, the ventilation valve is communicated to the position above the water surface through a ventilation hose, and the sealing cover is buckled on a steel outer plate of a broadside pipe opening in a covering mode. The centering pipe fitting is inserted into the broadside pipe, the switch type magnetic base is adjusted to form a magnetic field with the steel outer plate to generate attraction force, and then the sealing cover and the steel outer plate are attached together to generate the sealing effect. Seawater is temporarily prevented from entering the ship or offshore platform structure, so that the purpose of removing the sea valve in the structure for maintenance or replacement is achieved.

Description

Technical Field

[0001] The invention relates to the technical fields of offshore wind turbine generator sets, ships, marine platforms and the like, and in particular to a plugging device and an underwater repair and replacement method for a sea valve. Background Art

[0002] When the existing sea valve of the pipeline system of a ship or offshore platform fails, it can only be towed into the dock and then dry-docked to repair or replace the sea valve. This not only consumes a lot of manpower and financial resources of the owner, but also greatly affects the normal operation of the ship or platform due to the inability to fill or drain water normally during the waiting period for docking, and also increases its safety risks on the water.

[0003] Existing technologies such as CN110949639A "A method for repairing the moored state of a sea valve on a surface ship and a plugging tool suitable for the method" is a method for solving the problem of repairing or replacing a sea valve. However, if it is applied to a large sea valve box grille, it will be large, heavy, and require many operators, and there will be certain difficulties in operation. In addition, some sea valves are directly connected to the side pipe to communicate with the outside world. Since the watertight plate cannot be fixed, it is not suitable for this situation. At the same time, after repairing or replacing the sea valve, the plugging tool needs to be removed to allow seawater to contact the sea valve and form a certain pressure to verify whether it is installed in place and whether it is tight. At this time, if leakage or other phenomena occur, the plugging tool needs to be installed again, which prolongs the time of underwater workers and increases the risk factor of the operation. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a blocking device for underwater repair and replacement of sea valves, which temporarily prevents seawater from entering the interior of a ship or offshore platform structure, thereby achieving the purpose of removing the sea valve inside the structure and carrying out repair or replacement.

[0005] Another object of the present invention is to provide a method for underwater repair and replacement of sea valves.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A plugging device for underwater maintenance and replacement of sea valves comprises a sealing cover, a centering pipe, a plurality of switch-type magnetic seats, a tightness check valve, a breathable valve and a breathable hose, wherein the centering pipe is arranged at the inner center of the sealing cover, a plurality of switch-type magnetic seats are evenly distributed circumferentially on the sealing cover and located around the centering pipe, a tightness check valve and a breathable valve are arranged on the sealing cover and located above the centering pipe, the breathable valve is connected to the water surface through the breathable hose, the sealing cover is buckled on the steel outer plate of the port of the side pipe, the centering pipe is inserted into the inside of the side pipe, the switch-type magnetic seat is adjusted to form a magnetic field with the steel outer plate to generate attraction, thereby making the sealing cover and the steel outer plate firmly fit together and generating a sealing effect.

[0008] Furthermore, a groove is provided on the bottom surface of the sealing cover in contact with the steel outer plate, and a sealing ring is installed in the groove. The switch-type magnetic seat and the steel outer plate generate attraction and squeeze the sealing ring, thereby enhancing the sealing effect.

[0009] Furthermore, the centering pipe is made of a plastic pipe, and its outer diameter is smaller than the diameter of the side pipe.

[0010] Furthermore, the sealing cover is provided with a plurality of holes for installing the switch-type magnetic seat, and the switch-type magnetic seat is installed in the corresponding holes and fixed to the sealing cover by epoxy resin.

[0011] Furthermore, the sealing cover is made of aluminum or non-magnetic material and is provided with a transport handle.

[0012] Another object of the present invention is achieved by the following technical solutions:

[0013] A method for underwater repair and replacement of a sea valve, based on a plugging device, comprises the following steps:

[0014] S1. Use a plugging device to plug the side pipes equipped with sea valves to prevent seawater from entering the structure;

[0015] S2. Repair or replace the sea valve;

[0016] S3. Verify the sealing of the sea valve. If there is no leakage at the sealing part of the sea valve, it means that the sealing of the sea valve is qualified. If there is leakage, adjust the sea valve until there is no leakage at the sealing part of the sea valve.

[0017] S4. Remove the blocking device and complete the repair or replacement.

[0018] Further, in step S1, the marine organisms and attachments around the steel outer plate of the port of the side pipe are cleaned to ensure that there are no protrusions in the range covered by the plugging device, the air valve is opened to insert the centering pipe into the port pipe, and the sealing cover is pushed to the steel outer plate to ensure that the switch-type magnetic seat and the steel outer plate are in a fit state, the switch-type magnetic seat is adjusted to form a magnetic field with the steel outer plate to generate attraction, so that the sealing cover and the steel outer plate are firmly fitted together and produce a sealing effect, and finally the air valve is closed.

[0019] Further, in step S2, the fastening bolts of the sea valve are removed inside the structure to check the water leakage. If the water flow gradually decreases until no water flows out, the fastening bolts of the sea valve are completely removed and the sea valve is repaired or replaced. If the water flow does not decrease, the sealing performance of the sealing device and the steel outer plate is adjusted until no water flows out and then the sea valve is repaired or replaced.

[0020] Further, in step S3, the sea valve is closed, and the tightness inspection valve is opened to allow seawater to apply pressure to the sea valve for sealing verification after resetting. If there is no leakage at the sealing part of the sea valve, it means that the sealing of the sea valve is qualified. If leakage occurs, the sea valve is readjusted until there is no leakage at the sealing part of the sea valve.

[0021] Further, in step S4, the switch-type magnetic seat is adjusted to lose its magnetic attraction to the steel outer plate, and then the plugging device is pulled out of the water through the towing rope.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The present invention has the advantages of simple structure, light weight, convenient operation, strong environmental applicability, high safety, etc. Underwater personnel only need to touch the side pipe and insert the centering pipe into the side pipe in a dim underwater environment to ensure the accuracy of the covering position of the plugging device, and after insertion, they only need to operate the knob to fix it. The underwater operation is convenient, which can effectively shorten the underwater operation time, reduce the number of operators and costs, and because the overall structure is simple, it will not interfere with the equipment of underwater personnel, thereby ensuring the safety of underwater personnel.

[0024] 2. The present invention has high sealing performance. The switch-type magnetic seat and the steel outer plate form a magnetic field to generate attraction, so that the sealing cover and the steel outer plate are firmly attached together, and then the sealing effect is enhanced by further squeezing the sealing ring.

[0025] 3. The present invention provides a tightness check valve. When the sealing performance needs to be verified after repairing or replacing the sea valve, it is only necessary to open the tightness check valve to allow seawater to enter the side pipe for verification. It is unnecessary to disassemble and assemble the sealing device to verify the sealing performance of the sea valve after resetting. The operation is simple and the underwater operation time is further shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the blocking device of the present invention.

[0027] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0028] Figure 3 It is a top view of the blocking device of the present invention.

[0029] Figure 4 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] like Figures 1 to 3 As shown, the present embodiment provides a plugging device for underwater repair and replacement of sea valves, comprising a centering pipe fitting 1, a sealing cover 2, a plurality of switch-type magnetic seats 3, a tightness check valve 4, a breathable valve 8 and a breathable hose 9, wherein the centering pipe fitting 1 is arranged at the inner center of the sealing cover 2, a plurality of switch-type magnetic seats 3 are evenly distributed circumferentially on the sealing cover 2 and located around the centering pipe fitting 1, a tightness check valve 4 and a breathable valve 8 are arranged on the sealing cover 2 and located above the centering pipe fitting 1, and the breathable valve 8 is connected to the water surface through the breathable hose 9, the sealing cover 2 is buckled on the steel outer plate of the port of the side pipe, and the centering pipe fitting 1 is inserted into the inside of the side pipe 10, the switch-type magnetic seat 3 is adjusted to form a magnetic field with the steel outer plate 11 to generate attraction, so that the sealing cover 2 and the steel outer plate 11 are firmly fitted together and a sealing effect is generated.

[0033] Specifically, a groove is provided on the bottom surface of the sealing cover 2 in contact with the steel outer plate 11, and a sealing ring 6 is installed in the groove. The switch type magnetic seat 3 and the steel outer plate generate attraction and squeeze the sealing ring, thereby enhancing the sealing effect.

[0034] The sealing cover 2 is made of aluminum or non-magnetic material and is provided with a transport handle 7. The sealing cover 2 is provided with a plurality of holes for installing the switch type magnetic seat 3. The switch type magnetic seat 3 is installed in the corresponding holes and fixed to the sealing cover 2 by epoxy resin 5.

[0035] Specifically, the centering fitting 1 is made of a lightweight plastic pipe. Because of working in an underwater environment, low visibility may affect work efficiency. In order to improve the efficiency of underwater work and shorten working time, before launching the operation, it is necessary to select a suitable centering fitting 1 according to the diameter and length of the side pipe, so that the outer diameter of the centering fitting 1 is slightly smaller than the diameter of the side pipe. In this embodiment, the diameter of the sea valve and the side pipe is DN200, the specification of the side pipe is 219X12.5mm, and the inner diameter of the pipe is Ф194mm. At this time, the centering fitting 1 is made of a 180mm PVC pipe. After the centering fitting 1 is inserted, the problem of excessive installation deviation of the plugging device caused by poor visibility can be well solved.

[0036] This embodiment can remove the sea valve underwater for repair or replacement when the ship or offshore platform is relatively stationary. At the same time, there is no need to repeatedly disassemble and assemble the sealing device when verifying the tightness of the sea valve, which simplifies the operation process and shortens the underwater working time.

[0037] Embodiment 2:

[0038] like Figure 4 As shown, this embodiment provides a method for underwater repair and replacement of a sea valve, which is implemented based on the above-mentioned plugging device and includes the steps of:

[0039] S1. Use a plugging device to plug the side pipes equipped with sea valves to prevent seawater from entering the structure; specifically include:

[0040] When entering the water, the diver fastens the traction rope to the transport handle, then pulls the plugging device to the vicinity of the port of the side pipe, cleans the marine organisms and attachments around the steel outer plate of the port of the side pipe, ensures that there are no protrusions in the area covered by the plugging device, and ensures the flatness of the plugging device after installation. Then, open the air valve and insert the centering pipe into the side pipe, ensure that the range of shaking of the plugging device is within the gap between the inner wall of the side pipe and the outer wall of the centering pipe, then push the sealing cover to the steel outer plate, ensure that the switch-type magnetic seat and the steel outer plate are in contact, and use the air valve to prevent the reverse pressure generated by the residual gas or liquid inside when the plugging device is in contact with the side pipe from affecting the tightness effect. Rotate the switch-type magnetic seat to the open state so that it forms a magnetic field with the steel outer plate to generate attraction, thereby making the sealing cover and the steel outer plate firmly fit together and produce a sealing effect. When all the switch-type magnetic seats are opened and the plugging device is stable, close the air valve;

[0041] S2. Repair or replace the sea valve; specifically including:

[0042] The staff inside the structure will remove the fastening bolts of the sea valve inside the structure to check the water leakage. If the water flow gradually decreases until no water flows out, the fastening bolts of the sea valve will be completely removed and the sea valve will be repaired or replaced. If the water flow does not decrease significantly after a certain period of time, the sealing performance of the sealing device and the steel outer plate will be adjusted until no water flows out, and then the sea valve will be repaired or replaced.

[0043] S3. Verify the sealing of the sea valve. If there is no leakage at the sealing part of the sea valve, it means that the sealing of the sea valve is qualified. If there is leakage, adjust the sea valve until there is no leakage at the sealing part of the sea valve; specifically include:

[0044] The sea valve is in closed state, and the diver opens the tightness inspection valve to allow the sea water to give pressure to the sea valve for sealing verification after resetting. The staff inside the structure visually checks whether there is any leakage at the sealing of the sea valve. If there is no leakage at the sealing of the sea valve, it means that the sealing of the sea valve is qualified. If there is leakage, the tightness inspection valve is closed and the staff inside the structure adjust the installation state of the sea valve until there is no leakage at the sealing of the sea valve.

[0045] S4. Remove the blocking device and complete repair or replacement; specifically include:

[0046] The diver rotates the switch-type magnetic seat to the closed position to make it lose its magnetic attraction to the steel outer plate, then removes the entire sealing device and tows it to a state that is easy to float out of the water. The diver floats to the surface of the water along with the towing rope, and the sea valve can be used normally after all staff have safely landed.

[0047] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A plugging device for underwater repair and replacement of sea valves, characterized by: It includes a sealing cover, a centering pipe, multiple switch-type magnetic seats, a tightness test valve, a breathable valve and a breathable hose. The centering pipe is arranged at the inner center of the sealing cover. Multiple switch-type magnetic seats are evenly distributed circumferentially on the sealing cover and located around the centering pipe. A tightness test valve and a breathable valve are arranged on the sealing cover and located above the centering pipe. The breathable valve is connected to the water surface through a breathable hose. The sealing cover is buckled on the steel outer plate of the side pipe opening, and the centering pipe is inserted into the side pipe. The switch-type magnetic seat is adjusted to form a magnetic field with the steel outer plate to generate attraction, so that the sealing cover and the steel outer plate are firmly fitted together to produce a sealing effect.

2. The plugging device for underwater repair and replacement of sea valves according to claim 1 is characterized by: A groove is arranged on the bottom surface of the sealing cover in contact with the steel outer plate, and a sealing ring is installed in the groove. The switch-type magnetic seat and the steel outer plate generate attraction and squeeze the sealing ring, thereby enhancing the sealing effect.

3. The plugging device for underwater repair and replacement of sea valves according to claim 1 is characterized by: The centering pipe is made of a plastic pipe, and its outer diameter is smaller than the diameter of the side pipe.

4. The plugging device for underwater repair and replacement of sea valves according to claim 1 is characterized by: The sealing cover is provided with a plurality of holes for installing the switch-type magnetic seat. The switch-type magnetic seat is installed in the corresponding holes and fixed on the sealing cover by epoxy resin.

5. The plugging device for underwater repair and replacement of sea valves according to claim 1 is characterized by: The sealing cover is made of aluminum or non-magnetic material and is provided with a transport handle.

6. A method for underwater repair and replacement of a sea valve, implemented based on the plugging device according to any one of claims 1 to 5, characterized in that: Including steps, S1. Use a plugging device to plug the side pipes equipped with sea valves to prevent seawater from entering the structure; S2. Repair or replace the sea valve; S3. Verify the sealing of the sea valve. If there is no leakage at the sealing part of the sea valve, it means that the sealing of the sea valve is qualified. If there is leakage, adjust the sea valve until there is no leakage at the sealing part of the sea valve. S4. Remove the blocking device and complete the repair or replacement.

7. The method for underwater repair and replacement of a sea valve according to claim 6, characterized in that: In step S1, the marine organisms and attachments around the steel outer plate of the port of the side pipe are cleaned to ensure that there are no protrusions in the range covered by the plugging device, the air valve is opened to insert the centering pipe into the side pipe, and the sealing cover is pushed to the steel outer plate to ensure that the switch-type magnetic seat and the steel outer plate are in a fit state, the switch-type magnetic seat is adjusted to form a magnetic field with the steel outer plate to generate attraction, so that the sealing cover and the steel outer plate are firmly fitted together and produce a sealing effect, and finally the air valve is closed.

8. The method for underwater repair and replacement of a sea valve according to claim 6, characterized in that: In step S2, the fastening bolts of the sea valve are removed inside the structure to check the water leakage. If the water flow gradually decreases until no water flows out, the fastening bolts of the sea valve are completely removed and the sea valve is repaired or replaced. If the water flow does not decrease, the sealing performance of the sealing device and the steel outer plate is adjusted until no water flows out and then the sea valve is repaired or replaced.

9. The method for underwater repair and replacement of a sea valve according to claim 6, characterized in that: In step S3, the sea valve is closed, and the tightness inspection valve is opened to allow seawater to apply pressure to the sea valve for sealing verification after resetting. If there is no leakage at the sealing part of the sea valve, it means that the sealing of the sea valve is qualified. If leakage occurs, the sea valve is readjusted until there is no leakage at the sealing part of the sea valve.

10. The method for underwater repair and replacement of a sea valve according to claim 6, characterized in that: In step S4, the switch-type magnetic seat is adjusted to lose its magnetic attraction to the steel outer plate, and then the plugging device is pulled out of the water through the towing rope.

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