Internal and external pressure difference control system for underwater high-pressure dry type welding cabin

Abstract

The utility model discloses an underwater high-pressure dry-type welding cabin internal and external pressure difference control system, which belongs to the technical field of diving equipment, and comprises a dry-type welding cabin, a control module, an air source, a cabin internal air supply and exchange valve group and an exhaust valve group, the air source is arranged in the dry type welding cabin, the in-cabin air supply and exchange valve group and the exhaust valve group are both arranged in the dry type welding cabin, and the control module controls air inlet and exhaust of the in-cabin air supply and exchange valve group and the exhaust valve group through an umbilical cable. According to the system, the pressure difference inside and outside the welding cabin is monitored, adjusted and fed back, so that the pressure inside and outside the welding cabin is basically consistent, the underwater structural integrity of the welding cabin is ensured, the pressure difference control system can control the air humidity in the welding cabin through ventilation to meet the welding requirement, and the dry type welding cabin only bears small pressure difference and is convenient to operate. The requirement for the structural strength of the welding cabin is lowered, a high-strength pressure-resistant shell does not need to be designed, and the design and manufacturing cost is lowered.

Description

Technical Field

[0001] This utility model relates to the field of diving equipment technology, specifically to a pressure differential control system for an underwater high-pressure dry welding chamber. Background Technology

[0002] Currently, the complete salvage of large shipwrecks employs two methods: direct salvage using floating cranes and salvage using two barges with sleds. However, regardless of the method used, the installation of the bottom support wire ropes is a crucial step. The installation of the bottom support wire ropes typically involves non-contact drilling combined with underwater mud-dredging operations, along with high-precision underwater positioning, to complete the installation of dozens of sets of salvage wire ropes on the hull of the ship. The installation of the bottom support wire ropes is usually constrained by both seabed geology and water depth. If the seabed is too hard or the water is too deep, it will increase the difficulty of the operation, leading to excessively long construction periods or even making the operation impossible.

[0003] To address the challenge of installing the bottom-mounted steel cable, a novel method for installing salvage slings was proposed. Lifting lugs are installed at key structural locations (such as strong ribs) on the wrecked vessel, ensuring they possess the same quality as those used in air-medium welding. This eliminates the need for the salvage slings to pass under the hull of the sunken ship, thus avoiding the limitations imposed by seabed geology and water depth.

[0004] However, the installation of the aforementioned lifting lugs requires welding for fixation. Underwater welding cannot guarantee the welding strength if the water is not isolated. Therefore, dry welding is generally used to ensure the welding strength. Existing technology uses a welding chamber to isolate the welding water underwater. However, due to the high water pressure at great depths, the welding chamber also has high strength requirements. Therefore, a control device is needed to balance the pressure difference between the inside and outside of the welding chamber to reduce the strength requirements of the welding chamber material. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a pressure difference control system for the inside and outside of an underwater high-pressure welding chamber, which can balance the pressure difference between the inside and outside of the welding chamber.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an underwater high-pressure dry welding chamber pressure difference control system, including a dry welding chamber, and further including a control module, a gas source, an in-chamber air supply and exchange valve group and an exhaust valve group. The control module is located on the water surface and is connected to the dry welding chamber via an umbilical cable. The gas source is set inside the dry welding chamber. The in-chamber air supply and exchange valve group and the exhaust valve group are both set inside the dry welding chamber. The control module controls the air intake and exhaust of the in-chamber air supply and exchange valve group and the exhaust valve group via the umbilical cable.

[0007] Preferably, the dry welding chamber includes a welding chamber and an outer frame. One side of the welding chamber is attached to the wreck, and the outer frame is fixed to the welding chamber. An air source is set in the middle of the outer frame. The air source consists of multiple sets of air cylinders. A welding robot chamber is set inside the welding chamber. The welding robot chamber is a sealable chamber with a door on one side. The outlet of the air exchange valve group pipeline and the inlet of the exhaust valve group pipeline are both located inside the welding robot chamber.

[0008] Preferably, it also includes an in-chamber humidity monitoring module, which is installed inside the welding chamber to monitor the humidity inside the welding chamber.

[0009] Preferably, it also includes an internal and external pressure monitoring module, which includes an internal pressure sensor and an external pressure sensor. The internal pressure sensor is installed on the inner wall of the welding robot compartment, and the external pressure sensor is installed on the outer wall of the welding robot compartment.

[0010] Preferably, the internal and external pressure monitoring module is connected to the umbilical cable via a wire, and the umbilical cable is connected to the control module.

[0011] Preferably, the cabin humidity monitoring module is connected to an umbilical cable via a wire, and the umbilical cable is connected to a control module.

[0012] Preferably, the gas cylinders are connected together by an air inlet pipe, and an electrically controlled valve is installed on the pipe to control the opening and closing of the air inlet pipe.

[0013] Preferably, the exhaust valve assembly is located on both sides of the top of the welding chamber, and the exhaust valve assembly is connected to the umbilical cable via a wire to control its opening and closing.

[0014] Preferably, the air supply valve group in the cabin includes a control valve, an air source interface, and a pipeline. The air source interface is connected to a gas cylinder through a pipeline, the air source interface is connected to the control valve through a pipeline, and the control valve is connected to the welding robot cabin through a pipeline.

[0015] Preferably, the exhaust valve assembly includes control valve two, control valve three, an exhaust port, and a pipeline. Control valve two and control valve three are respectively connected to the welding robot compartment through pipelines, and control valve two and control valve three are respectively connected to the exhaust port through pipelines.

[0016] By adopting the technical solution of this utility model, the following beneficial effects can be obtained:

[0017] This utility model relates to an underwater high-pressure dry welding chamber differential pressure control system. By monitoring and adjusting the differential pressure inside and outside the welding chamber, the system ensures that the pressure inside and outside the welding chamber is basically the same, thereby ensuring the structural integrity of the welding chamber underwater. The differential pressure control system can also control the air humidity inside the welding chamber through ventilation to meet welding requirements. The dry welding chamber only withstands a small differential pressure, which reduces the requirements for the structural strength of the welding chamber and eliminates the need to design a high-strength pressure-resistant outer shell, thus reducing design and manufacturing costs. Attached Figure Description

[0018] The following is a brief explanation of the contents depicted in the accompanying drawings and the markings therein:

[0019] Figure 1 This is a schematic diagram of the differential pressure control system inside and outside the underwater high-pressure dry welding chamber;

[0020] Figure 2 The operating principle of the differential pressure control system Figure 1 ;

[0021] The markings in the above figures are as follows: 1. Dry welding chamber; 2. Welding chamber; 3. Outer frame; 4. Control module; 5. Gas source; 6. Gas cylinder; 7. In-chamber air supply and exchange valve group; 8. Exhaust valve group; 9. Internal and external pressure monitoring module; 10. In-chamber humidity monitoring module; 11. Umbilical cable; 12. Welding robot chamber. Detailed Implementation

[0022] The following description, with reference to the accompanying drawings, provides a more detailed explanation of the specific embodiments of this utility model, including the shape and structure of each component, the relative positions and connections between the parts, the functions and working principles of each part.

[0023] like Figure 1 , 2 As shown, the pressure difference control system inside and outside the underwater high-pressure dry welding chamber includes the dry welding chamber, as well as a control module 4, an air source 5, an air supply and exchange valve group 7 and an exhaust valve group 8. The control module 4 is located on the water surface and is connected to the dry welding chamber 1 via an umbilical cable 11. The air source 5 is located inside the dry welding chamber 1. The air supply and exchange valve group 7 and the exhaust valve group 8 are both located inside the dry welding chamber 1. The control module 4 controls the air intake and exhaust of the air supply and exchange valve group 7 and the exhaust valve group 8 via the umbilical cable 11.

[0024] The air supply valve group 7 in the cabin includes a control valve, an air source interface and a pipeline. The air source interface is connected to a gas cylinder through a pipeline. The air source interface is connected to the control valve through a pipeline. The control valve is connected to the welding robot cabin 12 through a pipeline.

[0025] The exhaust valve assembly 8 includes control valve two, control valve three, exhaust port and pipeline. Control valve two and control valve three are respectively connected to the welding robot compartment through pipelines, and valve two and control valve three are respectively connected to the exhaust port through pipelines.

[0026] The aforementioned dry welding chamber 1 includes a welding chamber 2 and an outer frame 3. One side of the welding chamber 2 is attached to the sunken ship, and the outer frame 3 is fixed to the welding chamber 2. An air source 5 is set in the middle of the outer frame 3. The air source 5 consists of multiple sets of air cylinders 6. A welding robot chamber 12 is set inside the welding chamber 2. The welding robot chamber 12 is a sealable chamber with a door on one side. The outlet of the air exchange valve group 7 and the inlet of the exhaust valve group 8 are both located inside the welding robot chamber 12.

[0027] like Figure 1 As shown, the humidity monitoring module 10 is installed inside the welding chamber 2 to monitor the humidity inside the welding chamber 2. The humidity monitoring module 10 is connected to the control module 4 via wires. It also includes an internal and external pressure monitoring module 9, which includes an internal pressure sensor and an external pressure sensor. The internal pressure sensor is installed on the inner wall of the welding robot chamber 12, and the external pressure sensor is installed on the outer wall of the welding robot chamber 12. Both the internal and external pressure sensors are connected to an umbilical cable 11 via wires, and the umbilical cable 11 is connected to the control module 4.

[0028] like Figure 1 , 2 As shown, gas cylinders 6 are connected together through an air intake pipe. An electric control valve 1 is installed on the pipe. The electric control valve 1 controls the opening and closing of the air intake pipe. The electric control valve 1 is connected to the umbilical cable 11 through a wire. The umbilical cable 11 is connected to the control module 4. The control module 4 controls the opening and closing of the electric control valve 1.

[0029] like Figure 1 , 2 As shown, the exhaust valve assembly 8 is located on both sides of the top of the welding chamber 2. The exhaust valve assembly 8 is equipped with two sets of exhaust control valves, namely electric control valve 2 and electric control valve 3. Electric control valve 2 controls the exhaust of gas from the welding chamber 2, and electric control valve 3 is a backup exhaust channel. The exhaust valve assembly 8 is connected to the umbilical cable 11 through a wire. The umbilical cable 11 is connected to the control module 4. The control module 4 controls the opening and closing of electric control valve 2 and electric control valve 3.

[0030] like Figure 1 , 2As shown, when the dry welding chamber 1 submerges, due to the continuous change in water depth, the internal and external pressure monitoring module 9 continuously monitors the water depth and the pressure inside the chamber and feeds it back to the PLC control module 4. After comparing the pressure difference between the inside and outside of the chamber, the PLC control module 4 sends a command to the air supply module to open the pneumatic control valve of the air supply module and introduce gas into the welding robot chamber 12, so that the pressure inside and outside the welding robot chamber 12 can be balanced when it submerges.

[0031] One side of welding compartment 2 is open, and a sealing ring is installed at the opening. After approaching the sunken ship, the water inside welding compartment 2 is pumped out, and welding compartment 2 adheres to the surface of the sunken ship due to water pressure. After the welding compartment is in place and the water inside welding compartment 2 is emptied, the hatch of welding robot compartment 12 can be opened, and the welding robot can begin to work.

[0032] When the welding robot starts working, the humidity monitoring module 10 inside the cabin monitors the humidity of the welding environment in real time. When the humidity exceeds a specified value, the sensor will send feedback to the control module 4. The control module 4 will then send a command to the ventilation module to open control valve two, allowing air to be released to the outside. At this time, due to the pressure change, the air supply module will start working, introducing dry air into the cabin to replace the more humid air and reduce the humidity inside the cabin. Once the humidity reaches the specified value, the PLC will close control valve two, and the air supply will also be shut off, forming a closed loop to control the humidity inside the cabin. By controlling the air intake and exhaust of the air supply and ventilation valve group 7 and the exhaust valve group 8 inside the cabin through the control module 4, the pressure balance inside and outside the cabin is ultimately achieved. The cabin maintains a roughly constant air pressure, ensuring that the water pressure outside the cabin is always greater than the air pressure inside the cabin, so that the welding cabin can be stably attached to the hull.

[0033] When the welding compartment finishes its work and rises to the surface, the welding robot is placed inside the welding robot compartment 12, its independent hatch is closed, and the welding robot compartment 12 is sealed. Water is injected into the welding compartment 2 to separate the welding compartment 2 from the sunken ship. The welding compartment rises, the water depth becomes shallower, and the pressure begins to drop. The pressure sensor of the internal and external pressure monitoring module 9 continuously monitors the water depth and the pressure inside the welding robot compartment 12. After comparing the pressure difference between the inside and outside of the compartment, the control module 4 sends a command to the exhaust valve group 8 to open the control valve 2 of the exhaust valve group 8, so that the pressure inside and outside of the welding compartment is balanced when it rises to the surface.

[0034] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A differential pressure control system for an underwater high-pressure dry welding chamber, comprising a dry welding chamber, characterized in that: It also includes a control module, an air source, an in-chamber air supply and exchange valve group, and an exhaust valve group. The control module is located on the water surface and is connected to the dry welding chamber via an umbilical cable. The air source is located inside the dry welding chamber. The in-chamber air supply and exchange valve group and the exhaust valve group are both located inside the dry welding chamber. The control module controls the air intake and exhaust of the in-chamber air supply and exchange valve group and the exhaust valve group via the umbilical cable.

2. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 1, characterized in that: The dry welding chamber includes a welding chamber and an outer frame. One side of the welding chamber is attached to the sunken ship, and the outer frame is fixed to the welding chamber. An air source is set in the middle of the outer frame. The air source consists of multiple sets of air cylinders. A welding robot chamber is set inside the welding chamber. The welding robot chamber is a sealable chamber with a door on one side. The outlet of the air exchange valve group pipeline and the inlet of the exhaust valve group pipeline are both located inside the welding robot chamber.

3. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 1, characterized in that: It also includes an in-chamber humidity monitoring module, which is installed inside the welding chamber to monitor the humidity inside the welding chamber.

4. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 2, characterized in that: It also includes an internal and external pressure monitoring module, which includes an internal pressure sensor and an external pressure sensor. The internal pressure sensor is installed on the inner wall of the welding robot compartment, and the external pressure sensor is installed on the outer wall of the welding robot compartment.

5. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 4, characterized in that: The internal and external pressure monitoring module is connected to the umbilical cable via a wire, and the umbilical cable is connected to the control module.

6. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 3, characterized in that: The cabin humidity monitoring module is connected to the umbilical cable via a wire, and the umbilical cable is connected to the control module.

7. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 2, characterized in that: The gas cylinders are connected in series via an intake pipe, and an electrically controlled valve is installed on the pipe to control the opening and closing of the intake pipe.

8. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 1, characterized in that: The exhaust valve assembly is located on both sides of the top of the welding chamber. The exhaust valve assembly is connected to the umbilical cable via a wire to control its opening and closing.

9. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 1, characterized in that: The air supply and exchange valve group inside the cabin includes a control valve, an air source interface and a pipeline. The air source interface is connected to a gas cylinder through a pipeline, and the air source interface is connected to the control valve through a pipeline. The control valve is connected to the welding robot cabin through a pipeline.

10. The pressure difference control system for the underwater high-pressure dry welding chamber according to claim 1, characterized in that: The exhaust valve assembly includes control valve two, control valve three, an exhaust port, and a pipeline. Control valve two and control valve three are respectively connected to the welding robot compartment through pipelines, and valve two and control valve three are respectively connected to the exhaust port through pipelines.

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