Multi-pipe-diameter air shield type underwater local drainage dry type welding system

Abstract

The invention discloses a multi-pipe-diameter air shield type underwater local drainage dry-type welding system which comprises a welding cabin, a sealing unit, a carbon dioxide protection welding unit, a visibility guarantee circulation unit, an air inlet unit and a power supply unit, the welding cabin is arranged above the sealing unit, the sealing unit is used for fixing a pipeline, an observation window is arranged on the welding cabin, and the sealing unit is used for sealing the pipeline. The observation window is provided with a hand hole, the hand hole is connected with an insulating glove, the carbon dioxide protection welding unit comprises a welding machine, a welding gun of the welding machine is arranged in the welding cabin, the visibility guarantee circulation unit comprises a demisting assembly and a smoke exhaust assembly, the demisting assembly and the smoke exhaust assembly are respectively connected with the upper part of the welding cabin, and the air inlet unit is communicated with the welding cabin. The device can be suitable for various underwater pipe diameters, stable gas inlet and water drainage can be achieved, the stability of welding shielding gas is kept, smoke and mist are reduced, and the welding quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of underwater pipeline welding technology, and in particular to a multi-diameter air shield type underwater partial drainage dry welding system. Background Technology

[0002] Deepwater oil and gas resource development is becoming a major growth point and a frontier of technological innovation in the world's petroleum industry. Underwater welding is one of the essential key technologies and processes for the construction and maintenance of offshore oil and gas facilities and subsea oil and gas pipelines.

[0003] Existing underwater welding drainage covers, including partial dry drainage covers and dry drainage covers, still have the potential to be affected by water pressure and hydrogen embrittlement in the welding area of ​​partial dry drainage covers (e.g., patent numbers CN201710047791.7, CN200910181141.0), resulting in weld strength lower than that of dry welding and making it difficult to meet the quality requirements of high-stress structures. Existing dry drainage covers (e.g., patent number CN201720301443.3) are only suitable for pipes of specific diameters and cannot guarantee the sealing of the welding process. They lack safety detection devices, cannot perform non-destructive preheating before welding, cannot guarantee the stability of the protective gas during welding, and cannot solve the problem of fog and smoke inside the drainage cover affecting visibility.

[0004] Therefore, it is necessary to design a drainage welding system based on underwater welding technology to solve the above-mentioned technical problems. Summary of the Invention

[0005] In order to solve all or some of the above problems, the present invention aims to provide a multi-diameter air shield underwater partial drainage dry welding system.

[0006] The present invention solves its problems through the following technical solution: A multi-diameter air-shield type underwater partial drainage dry welding system includes a welding chamber, a sealing unit, a carbon dioxide shielded welding unit, a visibility protection circulation unit, an air intake unit, and a power supply unit. The welding chamber is located above the sealing unit, which is used to fix the pipes. The welding chamber is equipped with an observation window and a handhole for connecting an insulating glove. The carbon dioxide shielded welding unit includes a welding machine, and the welding torch of the welding machine is located inside the welding chamber. The visibility protection circulation unit includes a defogging component and a fume extraction component, which are respectively connected to the upper part of the welding chamber. The defogging component is used to fill the welding chamber with defogging gas, and the fume extraction component is used to exhaust welding fumes. The air intake unit is connected to the welding chamber and is used to fill the welding chamber with inert gas. The power supply unit is used to supply power to the carbon dioxide shielded welding unit.

[0007] Optionally, the welding chamber is equipped with lighting, temperature sensors, humidity sensors, pressure sensors, cameras, an emergency stop control panel, and a drain outlet. The temperature sensors, humidity sensors, and pressure sensors are respectively located on both sides of the welding chamber. The emergency stop control panel is installed on the other side of the welding chamber opposite the handhole. The cameras and lighting are located on the upper part of both sides of the welding chamber. The drain outlet is located at a diagonal position at the bottom of the welding chamber, and a one-way valve is installed on the drain outlet.

[0008] Optionally, the carbon dioxide shielded welding unit further includes a carbon dioxide shielding gas cylinder, a welding cable, a welding torch, and a waterproof airbag for the welding torch. The welding cable is connected to the welding torch in the welding chamber through insulation and waterproofing, and the welding torch is placed in the waterproof airbag for the welding torch.

[0009] Optionally, the demisting assembly includes a high-pressure demisting gas cylinder, a demisting pipe, and a distributed demisting tube; the smoke exhaust assembly includes an exhaust hood, a follow-up slide rail, a smoke exhaust pipe, and a smoke filter. One end of the demisting pipe is connected to the high-pressure demisting gas cylinder, and the other end of the demisting pipe extends into the welding chamber and connects to the distributed demisting tube. The distributed demisting tube has multiple equidistant air holes. A silicone heating pad is installed at the air inlet of the distributed demisting tube to heat the demisting airflow. The distributed demisting tube is located at the top of the welding chamber. The exhaust hood is located on the other side of the welding chamber opposite the observation window. The exhaust hood is connected to the follow-up slide rail, which is located inside the welding chamber. Both ends of the smoke exhaust pipe are connected to the smoke filter and the exhaust hood, respectively.

[0010] Optionally, the air intake unit includes an air intake high-pressure cylinder, an air intake pipe, and an air intake port. The air intake port is located at the center of the top of the welding chamber. The air intake high-pressure cylinder is connected to the air intake port on the welding chamber through the air intake pipe. An air intake one-way valve is provided at the air intake port.

[0011] Optionally, the sealing unit includes a sealing chamber assembly and a pipe adjustment assembly, wherein the interior of the pipe adjustment assembly is used for installing a pipe, and the interior of the sealing chamber assembly is used for installing the pipe adjustment assembly.

[0012] Optionally, the sealing chamber assembly includes a first sealing chamber, a second sealing chamber, a first irregular-shaped sealing gasket, a second irregular-shaped sealing gasket, and a sealing chamber clamp. The first sealing chamber is connected to the welding chamber. A welding window is provided on the top of the first sealing chamber, and a baffle is provided near the observation window of the welding window. Corresponding first wing plates are provided at the contact positions of the first sealing chamber and the second sealing chamber. The first wing plates are connected by studs and nuts. A first groove is provided at the contact position of the first wing plates of the first sealing chamber and the second sealing chamber. First annular grooves are provided at the two ends of the inner sides of the first sealing chamber and the second sealing chamber that contact the pipeline adjustment assembly. The first irregular-shaped sealing gasket and the second irregular-shaped sealing gasket are embedded in the first groove and the first annular groove. A first clamp groove is provided on the outer side of the first sealing chamber and the second sealing chamber corresponding to the first annular groove. The sealing chamber clamp is located in the first clamp groove. A sealing chamber drain outlet is provided at the bottom of the second sealing chamber, and a one-way valve is installed at the sealing chamber drain outlet.

[0013] Optionally, the first airfoil has a stud groove corresponding to the stud, and ribs are provided on both sides of each stud groove corresponding to the second sealing chamber. The ribs have holes and are connected to the studs by hinges. Each stud is equipped with a corresponding horn nut. The first and second irregular sealing gaskets are pressed by tightening the horn nuts.

[0014] Optionally, the bottom wall of the exhaust hood is tangent to the upper surface of the first sealed chamber.

[0015] Optionally, the pipe adjustment assembly includes two sets of annular pipe adapter rings, which are respectively disposed at both ends of the sealing chamber assembly. An annular plate is provided on the outer side of the pipe adapter ring, and a second wing-shaped plate is provided along the contact position of the annular plate. A second groove is formed at the contact position of the second wing-shaped plate, and a second annular groove is formed on the inner side of the annular plate. A third and fourth shaped sealing gaskets are embedded in the second groove and the second annular groove. A second clamping groove is formed on the outer side of the annular plate and the second wing-shaped plate, and the second clamping groove corresponds to the position of the second annular groove. The adapter ring clamp is disposed in the second clamping groove, and the third and fourth shaped sealing gaskets are pressed together by the adapter ring clamp. The inner diameter of the pipe adapter ring is the same as the outer diameter of the pipe, and the outer wall of the pipe adapter ring contacts the inner walls of the first and second sealing chambers.

[0016] Optionally, it also includes a non-destructive preheating unit before welding, which includes silicone preheating sheets that are magnetically attached to both sides of the weld seam of the pipe.

[0017] In summary, the technical effects and advantages of this invention are as follows: By installing a defogging component and a fume extraction component in the welding chamber, the invention forms a gas circulation inside the welding chamber, reducing the impact of fog and fume on welding; the baffle plate and the bottom wall of the exhaust hood are tangent to the upper surface of the first sealed chamber, which can reduce the impact of defogging and fume extraction on the flow field of the welding area; the fume extraction hood is connected to the welding chamber by a follower slide rail, and the fume extraction hood can adapt to welds at different positions through the follower slide rail; This invention achieves sealing between the pipeline and the welding system through a first sealing chamber and a second sealing chamber. The integrally formed first and second irregular-shaped sealing gaskets make the sealing more effective. The first and second sealing chambers are connected by a hinge set on the second sealing chamber to achieve quick opening of the studs. Multiple sets of studs and clamps ensure uniform force on the first and second irregular-shaped sealing gaskets, achieving fast and effective sealing. This invention can effectively ensure the effectiveness of this invention in various pipe welding and maintenance processes by adjusting the pipe adapter ring of the pipe diameter adjustment unit to the required pipe diameter. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a multi-diameter air shield underwater partial drainage dry welding system according to an embodiment of the present invention.

[0020] Figure 2 This is a cross-sectional view of the welding chamber in one embodiment of the present invention; Figure 3 This is a schematic diagram of the intake unit in one embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a carbon dioxide shielded welding unit in one embodiment of the present invention; Figure 5 This is a schematic diagram of the visibility protection circulation unit in one embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of the first sealed chamber in one embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the first irregular-shaped sealing gasket in one embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the second sealed chamber in one embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the second irregular-shaped sealing gasket in one embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a pipeline regulating assembly in one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the fourth irregular-shaped sealing gasket in one embodiment of the present invention.

[0021] The components include: 1. Welding chamber; 2. Observation window; 3. Insulating gloves; 4. Handhole; 5. Sealing chamber clamp; 6. First sealing chamber; 6.1. Baffle plate; 6.2. Stud groove; 6.3. First irregular-shaped sealing gasket; 6.4. Non-destructive preheating unit before welding; 6.5. Pipe welding window; 7. Second sealing chamber; 7.1. Second irregular-shaped sealing gasket; 7.2. Horn nut; 7.3. Stud; 7.4. Sealing chamber drain outlet; 8. Pipe; 9. Adaptor ring clamp; 10. Pipe adjustment assembly; 10.1. Pipe adapter ring; 10.2. Third irregular-shaped sealing gasket; 10.3. Fourth irregular-shaped sealing gasket; 11. Visibility protection circulation unit; 11.1. Demisting high-pressure gas cylinder; 11.2. Demisting pipeline; 1.3 Exhaust hood; 11.4 Distributed demisting pipe; 11.5 Follow-up slide rail; 11.6 Smoke exhaust pipe; 11.7 Smoke filter; 12 Power supply unit; 13 Carbon dioxide shielded welding unit; 13.1 Welding torch waterproof airbag; 13.2 Welding torch; 13.3 Welding cable; 13.4 Welding machine; 13.5 Carbon dioxide shielding gas cylinder; 14 Air intake unit; 14.1 Air inlet; 14.2 Air intake pipe; 14.3 High-pressure air intake cylinder; 15 Lighting; 16 Temperature sensor; 17 Humidity sensor; 18 Drain outlet; 19 Insulation and waterproofing; 20 Pressure sensor; 21 Camera; 22 Emergency stop control panel; 23 Silicone heating wrapping pad. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This embodiment provides a multi-diameter air-shield type underwater partial drainage dry welding system suitable for underwater pipelines. It is applicable to various underwater pipe diameters, avoids repeated manufacturing, enables rapid installation, maintains reliable sealing, achieves stable air intake and drainage, keeps the welding torch in a waterless environment, provides non-destructive preheating before welding, maintains the stability of the welding shielding gas, reduces fumes and mist, ensures welding quality, and can monitor the welding environment in real time. In case of emergency, it can stop the operation in time to ensure the safety of welding personnel.

[0024] This embodiment provides a multi-diameter air-shield type underwater partial drainage dry welding system, such as... Figures 1-11 As shown, the system includes a welding chamber 1, a sealing unit, a carbon dioxide shielded welding unit 13, a visibility protection circulation unit 11, an air intake unit, and a power supply unit 12. The welding chamber 1 is located above the sealing unit, which is used to fix the pipe 8. The welding chamber 1 is provided with an observation window 2, and the observation window 2 is provided with a hand hole 4, which is connected to an insulating glove 3. The carbon dioxide shielded welding unit 13 includes a welding machine 13.4, and the welding torch 13.2 of the welding machine 13.4 is located inside the welding chamber 1. The visibility protection circulation unit 11 includes a defogging component and a fume extraction component, which are respectively connected to the upper part of the welding chamber 1. The defogging component is used to fill the welding chamber 1 with defogging gas, and the fume extraction component is used to exhaust welding fumes. The air intake unit is connected to the welding chamber 1 and is used to fill the welding chamber 1 with inert gas. The power supply unit 12 is used to supply power to the carbon dioxide shielded welding unit 13.

[0025] Specifically, the welding chamber 1 is equipped with lighting 15, temperature sensor 16, humidity sensor 17, pressure sensor 20, camera 21, emergency stop control panel 22, and drain outlet 18. The temperature sensor, humidity sensor, and pressure sensor are respectively located on both sides of the welding chamber 1. The emergency stop control panel is installed on the other side of the welding chamber 1 opposite to the handhole 4. The camera and lighting are located on the upper part of both sides of the welding chamber 1. The drain outlet is located at a diagonal position at the bottom of the welding chamber 1, and a drain check valve is installed on the drain outlet.

[0026] In this embodiment, the handhole 4 is located on the observation window 2. The handhole 4 is connected to the insulating glove 3 via a handhole bolt, providing insulation underwater. Temperature sensor 16, humidity sensor 17, and pressure sensor 20 are located on both sides of the welding chamber 1. The emergency stop control panel 22 is installed on the other side of the welding chamber 1 opposite to the handhole 4. The camera 21 and lighting 15 are located on the upper sides of the welding chamber 1. The lighting 15 provides a good working environment, and the sensors and camera 21 can monitor the welding personnel's working environment and status in real time. The emergency stop control panel 22 ensures that welding personnel can stop work promptly in case of emergencies in complex underwater environments, ensuring the safe operation of the underwater welding process. The design of the emergency stop control panel 22 is existing technology. Two drain outlets 18 are located diagonally at the bottom of the welding chamber 1, and one-way valves are installed on the drain outlets 18 to prevent water backflow.

[0027] Specifically, the carbon dioxide shielded welding unit 13 also includes a carbon dioxide shielding gas cylinder 13.5, a welding cable 13.3, a welding torch 13.4, and a welding torch waterproof airbag 13.1. The welding cable is connected to the welding torch in the welding chamber 1 through insulation and waterproofing, and the welding torch is placed in the welding torch waterproof airbag 13.1.

[0028] In this embodiment, the carbon dioxide shielded welding unit 13 includes a carbon dioxide shielding gas cylinder 13.5, a welding machine 13.4, a welding cable 13.3, a welding torch 13.2, and a welding torch waterproof airbag 13.1. The welding cable 13.3 is connected to the welding torch 13.2 in the welding chamber 1 through an insulating waterproof 19. The welding torch 13.2 is placed in the welding torch waterproof airbag 13.1 to keep the welding torch 13.2 in a water-free environment.

[0029] Specifically, the demisting assembly includes a high-pressure demisting cylinder 11.1, a demisting pipe 11.2, and a distributed demisting pipe 11.4. The smoke exhaust assembly includes an exhaust hood 11.3, a follow-up slide rail 11.5, a smoke exhaust pipe 11.6, and a smoke filter 11.7. One end of the demisting pipe 11.2 is connected to the high-pressure demisting cylinder 11.1, and the other end of the demisting pipe 11.2 extends into the welding chamber 1 and connects to the distributed demisting pipe 11.4. The distributed demisting pipe 11.4 has multiple... The distributed demister 11.4 has equidistant air vents and a silicone heating pad is installed at the air inlet of the distributed demister 11.4. The silicone heating pad is used to heat the demister airflow. The distributed demister 11.4 is located on the upper part of the welding chamber 1. The exhaust hood 11.3 is located on the other side of the welding chamber 1 opposite to the observation window 2. The exhaust hood 11.3 is connected to the follower slide rail 11.5, which is located inside the welding chamber 1. The two ends of the smoke exhaust pipe 11.6 are connected to the smoke filter 11.7 and the exhaust hood 11.3, respectively.

[0030] In this embodiment, the visibility protection circulation unit 11 includes a high-pressure demisting gas cylinder 11.1, a demisting pipe 11.2, a distributed demisting pipe 11.4, an exhaust hood 11.3, a follow-up slide rail 11.5, a smoke exhaust pipe 11.6, and a smoke filter 11.7. The distributed demisting pipe 11.4 has five equidistant air holes. A silicone heating and wrapping pad 23 is installed at the air inlet of the distributed demisting pipe 11.4 to heat the demisting airflow and improve the demisting effect. The distributed demisting pipe 11.4 is located on the upper part of the welding chamber 1 and is connected to the welding chamber through a circular boss set in the welding chamber 1 and fixed to the boss by a pin. The exhaust hood 11.3 is located on the other side of the welding chamber opposite to the observation window. The exhaust hood 11.3 is connected to the follow-up slide rail 11.5 to adapt to the welding smoke exhaust requirements of welds at different positions. The bottom wall of the exhaust hood 11.3 is tangent to the upper surface of the first sealing chamber 6 to reduce the influence of the exhaust smoke flow field on the welding shielding gas. The visibility protection circulation unit 11 effectively removes fog from the observation window 2 caused by temperature differences, maintaining high visibility and promptly removing welding fumes to ensure visibility during the welding process. The demisting high-pressure gas cylinder 11.1 typically uses an inert gas, such as nitrogen or high-pressure air for drainage. Gas demisting mainly refers to the process of removing suspended liquids and droplets (fog, mist) from the airflow, primarily based on physical separation methods. The use of the demisting high-pressure gas cylinder here is mainly for cleaning the observation window area of ​​this product, facilitating personnel observation.

[0031] Specifically, the air intake unit 14 includes an air intake high-pressure gas cylinder 14.3, an air intake pipe 14.2, and an air intake port 14.1. The air intake port is located at the center of the top of the welding chamber 1. The air intake high-pressure gas cylinder is connected to the air intake port on the welding chamber 1 through the air intake pipe. An air intake one-way valve is provided at the air intake port.

[0032] In this embodiment, the air intake unit 14 includes an air intake high-pressure gas cylinder 14.3, an air intake pipe 14.2, and an air inlet 14.1 (one in number). The air inlet 14.1 is located at the center of the top of the welding chamber. The air intake high-pressure gas cylinder 14.3 is connected to the air inlet 14.1 on the welding chamber 1 through the air intake pipe 14.2. An air inlet one-way valve is provided at the air inlet 14.1 to maintain a slightly positive pressure in the welding chamber 1. The air intake high-pressure gas cylinder usually uses an inert gas, with nitrogen being the most common. The function of the gas is to increase the droplet size or change its trajectory through physical means, causing the droplets to detach from the gas. The main reason for its application is that the gas-liquid density difference, viscosity, surface tension, etc., affect the coalescence effect.

[0033] Specifically, the sealing unit includes a sealing chamber assembly and a pipe adjustment assembly, the interior of which is used to install pipes, and the interior of the sealing chamber assembly is used to install the pipe adjustment assembly.

[0034] Further, the sealing chamber assembly includes a first sealing chamber 6, a second sealing chamber 7, a first irregular-shaped sealing gasket 6.3, a second irregular-shaped sealing gasket 7.1, and a sealing chamber clamp 5. The first sealing chamber 6 is connected to the welding chamber 1. A welding window is provided on the top of the first sealing chamber 6, and a baffle plate 6.1 is provided near the observation window 2. The contact positions of the first sealing chamber 6 and the second sealing chamber 7 are respectively provided with corresponding first wing plates. The first wing plates are connected by studs 7.3 and nuts. A first groove is provided at the contact position of the first wing plates of the first sealing chamber 6 and the second sealing chamber 7. The inner sides of the first sealing chamber 6 and the second sealing chamber 7 are respectively provided with first annular grooves at the two ends that contact the pipe 8 adjustment assembly. The first irregular-shaped sealing gasket 6.3 and the second irregular-shaped sealing gasket 7.1 are embedded in the first groove and the first annular groove. The outer side of the first sealing chamber 6 and the second sealing chamber 7 corresponding to the first annular groove is provided with a first clamp groove. The sealing chamber clamp 5 is provided in the first clamp groove. The bottom position of the second sealing chamber 7 is provided with a sealing chamber drain outlet 7.4. A one-way valve is installed at the sealing chamber drain outlet 7.4.

[0035] Optionally, the first airfoil plate is provided with a stud 7.3 groove 6.2 corresponding to the stud 7.3, and ribs are provided on both sides of each stud 7.3 groove 6.2 corresponding to the second sealing chamber 7. The ribs have holes and are connected to the stud 7.3 by hinges. Each stud 7.3 is equipped with a corresponding horn nut 7.2. Tightening the horn nut 7.2 will press the first irregular sealing gasket 6.3 and the second irregular sealing gasket 7.1.

[0036] In this embodiment, the first sealed chamber 6 and the welding chamber 1 are connected together by welding. A pipe welding window 6.5 is provided on the top of the first sealed chamber 6. A baffle plate 6.1 is welded near the observation window of the welding window 6.5. The baffle plate 6.1 maintains the stability of the welding shielding gas by reflecting the airflow generated by the defogging assembly, ensuring welding quality. Corresponding first airfoil plates are respectively provided at the contact positions of the first sealed chamber 6 and the second sealed chamber 7. Several corresponding stud grooves 6.2 (five on each first airfoil plate) are provided on the outer side of the first airfoil plate. First grooves are provided at the contact positions of the first airfoil plates of the first sealed chamber 6 and the second sealed chamber 7. The inner sides of the sealing chamber 7, where they contact the pipe adjustment assembly, are respectively provided with first annular grooves. The first grooves and first annular grooves on the first sealing chamber 6 and the second sealing chamber 7 are the embedding grooves for the first irregular sealing gasket 6.3 and the second irregular sealing gasket 7.1. Ribs are provided on both sides of each stud groove 6.2 in the second sealing chamber 7. The ribs have holes and are connected to the studs 7.3 by hinges, which can realize quick-opening connection. Each stud is equipped with a corresponding horn nut 7.2. By tightening the horn nut 7.2, the first irregular sealing gasket 6.3 and the second irregular sealing gasket 7.1 are pressed. The evenly distributed studs 7.3 can make the sealing position uniformly stressed to achieve effective sealing. A first clamp groove is provided on the outer side of the sealing chamber corresponding to the first annular groove on the inner side of the first sealing chamber 6 and the second sealing chamber 7. The sealing chamber clamp is located in the first clamp groove. The sealing chamber clamp 5 presses the first irregular sealing gasket 6.3 and the second irregular sealing gasket 7.1 of the first sealing chamber 6 and the second sealing chamber 7 in contact with the pipeline adjustment component. A sealing chamber drain outlet 7.4 is provided at the bottom of the second sealing chamber 7 to maintain a waterless environment for the first sealing chamber 6 and the second sealing chamber 7. A one-way valve is installed at the sealing chamber drain outlet 7.4 to prevent water backflow.

[0037] Optionally, the bottom wall of the exhaust hood 11.3 is tangent to the upper surface of the first sealed chamber 6.

[0038] In this embodiment, the bottom wall of the baffle plate 6.1 and the exhaust hood 11.3 is tangent to the upper surface of the first sealed chamber 6, which can reduce the impact of demisting and smoke exhaust on the flow field of the welding area.

[0039] Furthermore, the pipe adjustment assembly 10 includes two sets of annular pipe adapter rings 10.1, which are respectively located at both ends of the sealing chamber assembly. An annular plate is provided on the outer side of the pipe adapter ring 10.1, and a second wing-shaped plate is provided along the contact position of the annular plate. A second groove is formed at the contact position of the second wing-shaped plate, and a second annular groove is formed on the inner side of the annular plate. A third shaped sealing gasket 10.2 and a fourth shaped sealing gasket 10.3 are embedded in the second groove and the second annular groove. A second clamping groove is formed on the outer side of the annular plate and the second wing-shaped plate, and the second clamping groove corresponds to the position of the second annular groove. An adapter ring clamp 9 is located in the second clamping groove, and the third shaped sealing gasket 10.2 and the fourth shaped sealing gasket 10.3 are pressed together by the adapter ring clamp 9. The inner diameter of the pipe adapter ring 10.1 is the same as the outer diameter of the pipe 8, and the outer wall of the pipe adapter ring 10.1 contacts the inner walls of the first sealing chamber 6 and the second sealing chamber 7.

[0040] In this embodiment, the pipe adjustment assembly 10 includes two sets of annular pipe adapter rings, each set including two annular pipe adapter rings 10.1. The pipe adapter ring 10.1 has an annular plate arranged outward along the inner ring axis, and a second wing plate arranged along the contact position of the two annular plates. A second clamping groove is opened on the annular plate and the second wing plate. A second groove is opened on the contact surface of the second wing plate on the annular plate. A second annular groove is arranged on the inner side of the annular plate at a position corresponding to the second clamping groove. The adapter ring clamp 9 presses the third irregular sealing gasket 10.2 and the fourth irregular sealing gasket 10.3 to achieve effective sealing. The inner diameter of the pipe adapter ring 10.1 is the same as the outer diameter of the pipe 8. The outer diameter of the pipe adapter ring 10.1 contacts the first sealing chamber 6 and the second sealing chamber 7. The sealing between the first sealing chamber 6 and the second sealing chamber 7 and the pipe adapter ring 10.1 is completed by the force applied by the sealing chamber clamp 5. The pipe adjustment assembly 10 can realize the effective implementation of the welding system in various pipe environments.

[0041] Furthermore, it also includes a non-destructive preheating unit 6.4, which includes a silicone preheating sheet that is magnetically attached to both sides of the weld seam of the pipe 8.

[0042] In this embodiment, the non-destructive preheating unit 6.4 is composed of silicone preheating sheets and is connected to the pipe 8 by magnetic snaps to ensure the cyclic use and effective fixation of the non-destructive preheating unit 6.4. The silicone preheating sheets are placed on both sides of the weld to preheat the weld before welding and improve the quality of the weld formation.

[0043] In summary, this invention reduces the impact of fog and smoke on welding by installing defogging and fume extraction components in the welding chamber, creating gas circulation within the chamber. The baffle plate and the bottom wall of the exhaust hood are tangent to the upper surface of the first sealing chamber, further reducing the impact of defogging and fume extraction on the flow field in the welding area. The fume hood is connected to the welding chamber by a follower slide rail, allowing it to adapt to welds at different locations. This invention achieves sealing between the pipeline and the welding system through the first and second sealing chambers. The integrally formed first and second shaped sealing gaskets enhance sealing effectiveness. A hinge on the second sealing chamber enables quick opening of the studs, and multiple sets of studs and clamps ensure uniform force distribution on the first and second shaped sealing gaskets, achieving rapid and effective sealing. By replacing the pipe adapter ring of the pipe diameter adjustment unit to adjust to the required pipe diameter, this invention effectively ensures its effectiveness in various pipeline welding and maintenance applications.

[0044] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0045] Furthermore, the terms "a," "two," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A multi-diameter air-shield type underwater partial drainage dry welding system, characterized in that, The system includes a welding chamber, a sealing unit, a carbon dioxide shielded welding unit, a visibility protection circulation unit, an air intake unit, and a power supply unit. The welding chamber is located above the sealing unit, which is used to fix the pipeline. The welding chamber has an observation window with a handhole for connecting an insulated glove. The carbon dioxide shielded welding unit includes a welding machine, and the welding torch of the welding machine is located inside the welding chamber. The visibility protection circulation unit includes a defogging component and a fume extraction component, which are respectively connected to the upper part of the welding chamber. The defogging component is used to fill the welding chamber with defogging gas, and the fume extraction component is used to exhaust welding fumes. The air intake unit is connected to the welding chamber and is used to fill the welding chamber with inert gas. The power supply unit supplies power to the carbon dioxide shielded welding unit.

2. The multi-diameter air-shield type underwater partial drainage dry welding system according to claim 1, characterized in that, The welding chamber is equipped with lighting, temperature sensors, humidity sensors, pressure sensors, cameras, an emergency stop control panel, and a drain outlet. The temperature sensors, humidity sensors, and pressure sensors are respectively located on both sides of the welding chamber. The emergency stop control panel is installed on the other side of the welding chamber opposite the handhole. The cameras and lighting are located on the upper part of both sides of the welding chamber. The drain outlet is located at a diagonal position at the bottom of the welding chamber and is equipped with a one-way valve.

3. The multi-diameter air-shield type underwater partial drainage dry welding system according to claim 1, characterized in that, The carbon dioxide shielded welding unit also includes a carbon dioxide shielding gas cylinder, a welding cable, a welding torch, and a waterproof air bag for the welding torch. The welding cable is connected to the welding torch in the welding chamber through insulation and waterproofing, and the welding torch is placed in the waterproof air bag for the welding torch.

4. The multi-diameter air-shield type underwater partial drainage dry welding system according to claim 1, characterized in that, The demisting assembly includes a high-pressure demisting gas cylinder, a demisting pipe, and a distributed demisting tube. The smoke exhaust assembly includes an exhaust hood, a follow-up slide rail, a smoke exhaust pipe, and a smoke filter. One end of the demisting pipe is connected to the high-pressure demisting gas cylinder, and the other end extends into the welding chamber and connects to the distributed demisting tube. The distributed demisting tube has multiple equidistant air holes. A silicone heating pad is installed at the air inlet of the distributed demisting tube to heat the demisting airflow. The distributed demisting tube is located at the top of the welding chamber. The exhaust hood is located on the other side of the welding chamber opposite the observation window. The exhaust hood is connected to the follow-up slide rail, which is located inside the welding chamber. Both ends of the smoke exhaust pipe are connected to the smoke filter and the exhaust hood, respectively.

5. The multi-diameter air-shield type underwater partial drainage dry welding system according to claim 1, characterized in that, The air intake unit includes an air intake high-pressure cylinder, an air intake pipe, and an air intake port. The air intake port is located at the center of the top of the welding chamber. The air intake high-pressure cylinder is connected to the air intake port on the welding chamber through the air intake pipe. An air intake one-way valve is installed at the air intake port.

6. The multi-diameter air-shield type underwater partial drainage dry welding system according to claim 4, characterized in that, The sealing unit includes a sealing chamber assembly and a pipe adjustment assembly. The interior of the pipe adjustment assembly is used to install pipes, and the interior of the sealing chamber assembly is used to install the pipe adjustment assembly.

7. A multi-diameter air-shield type underwater partial drainage dry welding system according to claim 6, characterized in that, The sealing chamber assembly includes a first sealing chamber, a second sealing chamber, a first irregular-shaped sealing gasket, a second irregular-shaped sealing gasket, and a sealing chamber clamp. The first sealing chamber is connected to the welding chamber. A welding window is provided on the top of the first sealing chamber, and a baffle is provided near the observation window of the welding window. Corresponding first airfoil plates are provided at the contact positions of the first and second sealing chambers. The first airfoil plates are connected by studs and nuts. A first groove is provided at the contact position of the first airfoil plates of the first and second sealing chambers. First annular grooves are provided at the two ends of the inner sides of the first and second sealing chambers that contact the pipeline adjustment assembly. The first irregular-shaped sealing gasket and the second irregular-shaped sealing gasket are embedded in the first groove and the first annular groove, respectively. A first clamp groove is provided on the outer side of the first and second sealing chambers corresponding to the first annular groove. The sealing chamber clamp is located in the first clamp groove. A sealing chamber drain outlet is provided at the bottom of the second sealing chamber, and a one-way valve is installed at the sealing chamber drain outlet.

8. A multi-diameter air-shield type underwater partial drainage dry welding system according to claim 7, characterized in that, The first airfoil has a stud groove corresponding to the stud, and the second sealing chamber has ribs on both sides of each stud groove corresponding to the second stud. The ribs have holes and are connected to the studs by hinges. Each stud is equipped with a corresponding horn nut. Tightening the horn nut will compress the first and second irregular sealing gaskets. And / or, the bottom wall of the exhaust hood is tangent to the upper surface of the first sealed chamber.

9. A multi-diameter air-shield type underwater partial drainage dry welding system according to claim 7, characterized in that, The pipe adjustment assembly includes two sets of annular pipe adapter rings, which are respectively located at both ends of the sealing chamber assembly. An annular plate is provided on the outer side of each pipe adapter ring, and a second wing-shaped plate is provided along the contact position of the annular plate. A second groove is formed at the contact position of the second wing-shaped plate, and a second annular groove is formed on the inner side of the annular plate. A third and fourth shaped sealing gaskets are embedded in the second groove and the second annular groove. A second clamping groove is formed on the outer side of the annular plate and the second wing-shaped plate, and the second clamping groove corresponds to the second annular groove. The adapter ring clamp is located in the second clamping groove, and the third and fourth shaped sealing gaskets are pressed together by the adapter ring clamp. The inner diameter of the pipe adapter ring is the same as the outer diameter of the pipe, and the outer wall of the pipe adapter ring contacts the inner walls of the first and second sealing chambers.

10. A multi-diameter air-shield type underwater partial drainage dry welding system according to claim 1, characterized in that, It also includes a non-destructive preheating unit before welding, which includes silicone preheating sheets that are magnetically attached to both sides of the weld seam of the pipe.

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