Cabin penetration pipe fitting, ship body welding structure and assembling method

Abstract

The invention discloses a cabin penetration pipe fitting, a ship body welding structure and an assembling method.The cabin penetration pipe fitting comprises a titanium alloy overflowing body, steel cabin wall flanges and a threaded cover, the titanium alloy overflowing body comprises a pipe body, two end flanges, a transition flange and a convex shoulder, and the steel cabin wall flanges are arranged outside the pipe body in a sleeving mode at intervals; the steel bulkhead flange is connected with the transition flange through a stud, the steel bulkhead flange is used for being welded to a bulkhead or a deck, an annular cover body of the threaded cover is arranged between the protruding shoulder and the steel bulkhead flange in a sleeved mode, and a cylinder body of the threaded cover is in threaded connection with the steel bulkhead flange. And sealing elements are arranged between the transition flange and the steel bulkhead flange, between the cylinder body and the steel bulkhead flange and between the annular cover plate and the convex shoulder. According to the scheme, the defect of weld joint failure in a titanium and steel welding scheme is overcome, the harm of electrochemical corrosion caused by dissimilar metal contact when a steel penetration piece and a titanium alloy pipeline are connected in a traditional scheme is avoided, and the water tightness of a bulkhead and a deck is maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of through-tank pipe fittings, and in particular to a through-tank pipe fitting, a hull welding structure and an assembly method. Background Art

[0002] With the rapid development of shipbuilding, titanium alloy piping is becoming increasingly common. Bulkheads and decks are made of steel. Because titanium and steel form brittle compounds at high welding temperatures, this can lead to weld failure. When titanium alloy piping penetrates steel bulkheads and decks, through-the-tank fittings typically require conventional, thickened carbon steel short pipes with flanges on both ends. These are then connected to the titanium alloy system piping via these flanges.

[0003] However, the chemical activity of iron is higher than that of titanium. In seawater environment, steel through-tank pipe fittings will be transformed into sacrificial anodes of the entire seawater pipeline, thereby aggravating the corrosion of the through-tank pipe fittings and affecting the safety and life of the seawater pipeline.

[0004] In addition, no matter how the through-tank pipes are improved, the watertightness of the bulkheads and decks must be ensured. Summary of the Invention

[0005] In order to solve the above problems, the present application provides a through-tank pipe fitting, a hull welding structure and an assembly method.

[0006] The present application provides a through-tank pipe fitting, comprising a titanium alloy flow-through body, a steel bulkhead flange and a threaded cover. The titanium alloy flow-through body comprises a pipe body, two end flanges, a transition flange and a boss. The two end flanges are respectively connected to the axial ends of the pipe body, the transition flange and the boss are spaced apart from each other and are fixedly sleeved on the outside of the pipe body, the steel bulkhead flange is sleeved on the outside of the pipe body at intervals, the steel bulkhead flange and the transition flange are connected by studs, the inner diameter of the steel bulkhead flange is larger than the outer diameter of the boss, the steel bulkhead flange is used for welding to the bulkhead or deck, the threaded cover comprises a concentrically arranged annular cover body and a cylinder body, one axial end of the cylinder body is connected to the thickness side of the annular cover body, the annular cover body is sleeved between the boss and the steel bulkhead flange, and the cylinder body is threadedly connected to the steel bulkhead flange, wherein sealing members are installed between the transition flange and the steel bulkhead flange, between the cylinder body and the steel bulkhead flange, and between the annular cover plate and the boss.

[0007] In some embodiments, the steel bulkhead flange is provided with radially distributed pressure measuring holes, one end of which is connected to the inner circumference of the steel bulkhead flange. The pressure measuring holes avoid the cylinder, and a pressure measuring joint is installed on the pressure measuring holes.

[0008] In some embodiments, the steel bulkhead flange is provided with a plurality of screw holes for stud connection with the flange holes of the transition flange one by one, and the screw holes are provided on one axial side of the steel bulkhead flange; the steel bulkhead flange is provided with an internal thread on the inner circumference side, the internal thread is connected to the external thread of the cylinder, and the internal thread is close to the axial side of the steel bulkhead flange away from the screw holes; the pressure measuring holes are distributed in the area between the screw holes and the internal thread.

[0009] In some embodiments, an electrical insulation assembly is installed between the steel bulkhead flange and the transition flange. The electrical insulation assembly includes an insulating sleeve, a gasket and a measuring piece. The insulating sleeve includes a concentrically arranged ring portion and a cylindrical portion. One axial end of the cylindrical portion is connected to the thickness side of the ring portion. The inner hole of the ring portion is aligned with the inner hole of the cylindrical portion. The ring portion and the cylindrical portion are both sleeved outside the stud. The cylindrical portion is attached to the inner wall of the flange hole of the transition flange. The ring portion is arranged outside the flange hole of the transition flange. The gasket is sleeved outside the stud. The gasket is arranged between the ring portion and a nut installed on the stud. The measuring piece is sleeved outside the stud. The measuring piece is arranged between the ring portion and the transition flange. When the nut is tightened, the nut, gasket, ring portion, measuring piece and transition flange are pressed tightly in sequence.

[0010] In some embodiments, the connection position between the cylinder and the annular cover is located between the inner and outer circumferences of the annular cover; the cylinder is provided with a first groove, the first groove is distributed along the entire circumferential circle of the cylinder, the first groove is located on the outer peripheral side of the cylinder, the first groove is located between the external thread of the cylinder and the annular cover plate, and the seal installed in the first groove abuts against the steel bulkhead flange to achieve sealing between the cylinder and the steel bulkhead flange.

[0011] In some embodiments, the connection position between the cylinder and the annular cover body is located between the inner and outer peripheries of the annular cover body; the boss is provided with a second groove, the second groove is distributed along the entire circumferential circle of the boss, and the second groove is provided on the side of the boss away from the transition flange, and the seal installed in the second groove abuts against the annular cover plate to achieve sealing between the annular cover plate and the boss.

[0012] In some embodiments, the steel bulkhead flange is provided with a third groove, which is distributed along the entire circumferential circle of the steel bulkhead flange. The third groove is provided at the axial end of the steel bulkhead flange adjacent to the transition flange. The seal installed in the third groove abuts against the transition flange to achieve sealing between the transition flange and the steel bulkhead flange.

[0013] In some embodiments, the titanium alloy flow-through body is made of the same material as the titanium alloy pipeline connected to the end flange; and the steel bulkhead flange is made of the same material as the bulkhead or deck welded to the steel bulkhead flange.

[0014] A hull welding structure is provided with the above-mentioned through-tank pipe fitting installed on the bulkhead and / or deck, wherein the two end flanges of the titanium alloy flow-through body in the through-tank pipe fitting are respectively connected to the titanium alloy pipelines.

[0015] An assembly method for assembling the above-mentioned through-tank pipe fitting, wherein the first end flange is located on the side of the shoulder away from the transition flange of the two end flanges. The assembly method comprises:

[0016] If only the first end flange is not installed on the pipe body, insert the steel bulkhead flange and threaded cover into the pipe body in sequence;

[0017] After inserting the pipe body, the steel bulkhead flange and the transition flange are studded and the threaded cover is threadedly connected to the steel bulkhead flange;

[0018] After completing the stud connection and threaded connection, the first end flange is welded to the pipe body.

[0019] The beneficial effects of the present application are as follows: a through-tank pipe fitting is provided, comprising a titanium alloy flow-through body, a steel bulkhead flange and a threaded cover, the steel bulkhead flange is used for welding to a bulkhead or deck, the titanium alloy flow-through body comprises a pipe body, two end flanges, a transition flange and a boss, the steel bulkhead flange and the transition flange are connected to each other by studs, the threaded cover comprises a concentrically arranged annular cover body and a cylinder body, the annular cover body is sleeved between the boss and the steel bulkhead flange, and the cylinder body is threadedly connected to the steel bulkhead flange; the solution of the present application is adopted to support titanium alloy pipelines passing through steel bulkheads / decks, and by welding the steel bulkhead flange to the bulkhead or deck, the transition flange of the titanium alloy flow-through body is connected to the steel bulkhead flange by studs, thereby avoiding the defect of weld failure in the titanium and steel welding solution. By installing seals between the transition flange and the steel bulkhead flange, between the cylinder and the steel bulkhead flange, and between the annular cover and the boss, on the one hand, the seals create a gap area between the transition flange of the titanium alloy flow-through body and the steel bulkhead flange, and between the annular cover of the threaded cover and the boss of the titanium alloy flow-through body, thereby avoiding the hazard of galvanic corrosion caused by contact between dissimilar metals when connecting the steel through-tank parts and the titanium alloy pipelines in the traditional solution. On the other hand, the seals ensure the sealing between the transition flange and the steel bulkhead flange, between the cylinder and the steel bulkhead flange, and between the annular cover and the boss. The present application solution can simultaneously withstand the internal pressure of the pipeline system and the external pressure of the cabin environment, and maintain the watertightness of the bulkhead and deck. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention.

[0021] Figure 1 This is a schematic structural diagram of a titanium alloy flow-through body in a through-tank pipe provided in this application;

[0022] Figure 2This is a schematic structural diagram of a steel bulkhead flange in a through-tank pipe fitting provided in this application;

[0023] Figure 3 This is a schematic structural diagram of a threaded cover in a through-tank pipe provided in this application;

[0024] Figure 4 This is a schematic diagram of the assembly of a through-tank pipe provided in this application;

[0025] Figure 5 A schematic diagram of the installation of an electrical insulation component in a through-tank pipe provided in this application.

[0026] Drawing markings: 100-titanium alloy flow body, 110-tube body, 120-end flange, 121-first end flange, 130-transition flange, 140-boss shoulder, 141-second groove, 200-steel bulkhead flange, 210-stud, 211-screw hole, 212-nut, 220-pressure measuring hole, 230-internal thread, 240-third groove, 300-threaded cover, 310-annular cover, 320-cylinder, 321-external thread, 322-first groove, 400-seal, 500-electrical insulation component, 510-insulating sleeve, 511-ring, 512-cylinder, 520-gasket, 530-measuring piece, 20-bulkhead. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0028] In addition, this application may repeat reference numbers and / or reference letters in different examples. This repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials, but those of ordinary skill in the art will recognize the application of other processes and / or the use of other materials.

[0029] The present application provides a through-tank pipe fitting, comprising a titanium alloy flow-through body 100, a steel bulkhead flange 200 and a threaded cover 300. Figure 1 、 Figure 2 and Figure 3 The schematic diagrams of the structure including the titanium alloy flow body 100, the steel bulkhead flange 200 and the threaded cover 300 are shown respectively. Figure 4 The assembly diagram of the through-tank pipe fittings is shown.

[0030] Please refer to Figure 1 The titanium alloy flow-through body 100 includes a pipe body 110 and two end flanges 120. The pipe body 110 is a tubular structure having an axial direction, and an end flange 120 is connected to each of the axial ends of the pipe body 110. In application, the end flanges 120 are flange-connected to the pipe ends of the titanium alloy pipeline. Specifically, one end flange 120 is connected to the pipe end of the titanium alloy pipeline on the inner side of the bulkhead 20 or deck, and the other end flange 120 is connected to the pipe end of the titanium alloy pipeline on the outer side of the bulkhead 20 or deck. The through-tank pipe fitting of the present application allows the titanium alloy pipeline to pass through and penetrate the bulkhead or deck.

[0031] Please refer to Figure 1 The titanium alloy flow body 100 includes a transition flange 130 and a boss 140. Both the transition flange 130 and the boss 140 are annular structures. The transition flange 130 is fixedly sleeved on the outside of the pipe body 110, and the boss 140 is fixedly sleeved on the outside of the pipe body 110. The transition flange 130 and the boss 140 are spaced apart from each other in the axial direction of the pipe body 110. Generally speaking, the transition flange 130 and the pipe body 110 are connected by welding, and the boss 140 and the pipe body 110 are connected by welding.

[0032] It should also be noted that the material of the titanium alloy flow body 100 is titanium alloy, and a complete titanium alloy pipe can be used to produce the titanium alloy flow body 100. In a preferred embodiment, the material of the titanium alloy flow body 100 is consistent with that of the titanium alloy pipe connected to the end flange 120.

[0033] Please refer to Figure 2 The steel bulkhead flange 200 is an annular structure. The inner diameter of the steel bulkhead flange 200 is larger than the outer diameter of the boss 140. The steel bulkhead flange 200 is made of steel and is welded to the bulkhead 20 or deck. In a preferred embodiment, the steel bulkhead flange 200 is made of the same material as the bulkhead 20 or deck to which it is welded.

[0034] Please refer to Figure 3 The threaded cover 300 includes an annular cover body 310 and a cylindrical body 320. Both the annular cover body 310 and the cylindrical body 320 are annular structures. The annular cover body 310 is connected to one axial end of the cylindrical body 320. The annular cover body 310 and the cylindrical body 320 are concentrically arranged, and the cylindrical body 320 is connected to one side of the thickness of the annular cover body 310. It should be pointed out that the annular cover body 310 has an outer peripheral side and an inner peripheral side, and the cylindrical body 320 is connected between the outer peripheral side and the inner peripheral side of the annular cover body 310, so that in the radial direction of the cylindrical body 320, the annular cover body 310 presents a structural form with protrusions on both sides compared to the cylindrical body 320.

[0035] It should also be noted that the threaded cover 300 is made of steel. In a preferred embodiment, the threaded cover 300 is made of the same material as the bulkhead or deck welded to the steel bulkhead flange 200. Consistent material means the same material.

[0036] Please refer to Figures 1 to 4 , Figure 4 The assembly method of the titanium alloy flow body 100, the steel bulkhead flange 200 and the threaded cover 300 is shown. Specifically, the steel bulkhead flange 200 is sleeved outside the pipe body 110, the steel bulkhead flange 200 and the transition flange 130 are connected by studs 210, the annular cover 310 is sleeved between the boss 140 and the steel bulkhead flange 200, and the cylinder 320 is threadedly connected to the steel bulkhead flange 200. Please refer to Figure 4 A seal 400 is installed between the transition flange 130 and the steel bulkhead flange 200, a seal 400 is installed between the cylinder 320 and the steel bulkhead flange 200, and a seal 400 is installed between the annular cover plate and the boss 140. The seal 400 can be an O-ring as shown in the figure, or it can be other forms of sealing structures other than the O-ring.

[0037] The through-tank pipe fittings of the present application are applied to the titanium alloy piping system of a ship to support the titanium alloy piping to penetrate the steel bulkhead or deck. Figure 4 The middle threaded cover 300 is arranged on the outside of the bulkhead 20, and the transition flange 130 is arranged on the inside of the bulkhead 20. When the through-tank pipe is installed on the deck, its presentation is the same as Figure 4 Similar, the deck replaces Figure 4 The position of the bulkhead 20 in the.

[0038] Since the transition flange 130 of the titanium alloy flow-through body 100 is connected to the steel bulkhead flange 200 via the studs 210, the cylinder 320 of the threaded cover 300 is threadedly connected to the steel bulkhead flange 200, and the boss 140 of the titanium alloy flow-through body 100 and the annular cover body 310 of the threaded cover 300 are connected via the seal 400, the present application scheme does not involve the high-temperature implementation method of titanium and steel welding during installation, thereby avoiding the defect of weld failure in the titanium and steel welding scheme and ensuring the long-term normal operation of the titanium alloy piping system.

[0039] By adopting the through-tank pipe fitting of the present application, the sealing between the titanium alloy flow-through body 100 and the steel bulkhead flange 200 is achieved by installing the sealing member 400 between the transition flange 130 and the steel bulkhead flange 200. The sealing between the steel bulkhead flange 200 and the threaded cover 300 is achieved by installing the sealing member 400 between the cylinder 320 and the steel bulkhead flange 200. The sealing between the threaded cover 300 and the titanium alloy flow-through body 100 is achieved by installing the sealing member 400 between the annular cover plate and the boss 140. Figure 4 The titanium alloy flow-through body 100, the steel bulkhead flange 200 and the threaded cover 300 shown together enclose an internal cavity, which is distributed around the axis of the titanium alloy flow-through body 100. The sealing of the internal cavity is ensured by the above-mentioned three seals 400, thereby reducing the possibility of water leakage between the transition flange 130 and the steel bulkhead flange 200, thereby improving the leakage defects caused by the openings in the bulkhead 20 or the deck, ensuring the watertightness of the bulkhead 20 and the deck, and the through-tank pipe fittings of the present application can simultaneously withstand the internal pressure of the pipeline system and the external pressure of the cabin environment.

[0040] On the other hand, when assembled, the seal 400 is in an elastically contracted state. For example, when the seal 400 is installed between the transition flange 130 of the titanium alloy flow body 100 and the steel bulkhead flange 200, the contracted state also slightly separates the transition flange 130 from the steel bulkhead flange 200, creating a gap between the transition flange 130 of the titanium alloy flow body 100 and the steel bulkhead flange 200. This gap is divided into an outer ring region located outside the outer periphery of the seal 400 and an inner ring region located within the inner periphery of the seal 400. Similarly, a gap region exists between the annular cover plate of the threaded cap 300 and the shoulder 140 of the titanium alloy flow body 100. These two gap regions prevent direct contact between the titanium alloy and the steel, thereby avoiding the galvanic corrosion hazards associated with dissimilar metal contact when connecting steel bulkhead components to titanium alloy pipelines in conventional solutions, ensuring the safety and service life of the seawater pipeline.

[0041] In some embodiments, see Figure 3 The connection position between the cylinder 320 and the annular cover 310 is located between the inner and outer peripheries of the annular cover 310. The cylinder 320 is provided with a first groove 322. The first groove 322 is distributed along the entire circumference of the cylinder 320. The first groove 322 is located on the outer periphery of the cylinder 320. The first groove 322 is located between the external thread 321 of the cylinder 320 and the annular cover plate. Please refer to Figure 2 、 Figure 3 and Figure 4When the cylinder 320 is threadedly connected to the steel bulkhead flange 200, the seal 400 installed in the first groove 322 abuts against the steel bulkhead flange 200, so that the seal 400 installed in the first groove 322 maintains a sufficient elastic contraction state, thereby achieving a seal between the cylinder 320 and the steel bulkhead flange 200.

[0042] In some embodiments, see Figure 1 The boss 140 is provided with a second groove 141, which is distributed along the entire circumference of the boss 140 and is located on the side of the boss 140 away from the transition flange 130. Figure 3 The connection position between the cylinder 320 and the annular cover 310 is located between the inner and outer peripheries of the annular cover 310. Figure 1 、 Figure 3 and Figure 4 When the cylinder 320 is threadedly connected to the steel bulkhead flange 200, the seal 400 installed in the second groove 141 abuts against the annular cover plate, and as the threaded cover 300 continues to rotate and screw in, the seal 400 installed in the second groove 141 maintains a sufficiently elastic contraction state, thereby achieving a seal between the annular cover plate and the boss 140.

[0043] In some embodiments, see Figure 2 The steel bulkhead flange 200 is provided with a third groove 240. The third groove 240 is distributed along the entire circumference of the steel bulkhead flange 200. Figure 2 and Figure 4 The third groove 240 is provided at the axial end portion of the steel bulkhead flange 200 adjacent to the transition flange 130. Figure 1 、 Figure 2 and Figure 4 When the transition flange 130 and the steel bulkhead flange 200 are connected by the studs 210, the seal 400 installed in the third groove 240 abuts against the transition flange 130, so that the seal 400 installed in the third groove 240 maintains a sufficient elastic contraction state, thereby achieving sealing between the transition flange 130 and the steel bulkhead flange 200.

[0044] In some embodiments, see Figure 2 The steel bulkhead flange 200 is provided with radially distributed pressure measuring holes 220. One end of the pressure measuring hole 220 is connected to the inner circumference of the steel bulkhead flange 200, so that the pressure measuring hole 220 is connected to the above-mentioned internal cavity. In order to ensure that the pressure measuring hole 220 works smoothly, it is also necessary to Figure 4In the illustrated installation, the pressure tap 220 is positioned away from the cylinder 320. A pressure tap is installed in the pressure tap 220. An instrument is connected via the tap to measure the pressure of the internal cavity. Compressed air is injected into the internal cavity to verify the sealing performance of the internal cavity. The use of the pressure tap 220 and pressure tap in this application improves the maintainability, testability, and safety of the solution.

[0045] In some embodiments, please refer to Figure 1 、 Figure 2 and Figure 4 The steel bulkhead flange 200 is provided with a plurality of screw holes 211, which correspond one-to-one with the flange holes of the transition flange 130 and are connected one-to-one via studs 210. The screw holes 211 are provided on one axial side of the steel bulkhead flange 200. The steel bulkhead flange 200 is provided with an internal thread 230 on the inner circumference, which is connected to the external thread 321 of the cylinder 320, thereby realizing the threaded connection between the steel bulkhead flange 200 and the threaded cover 300. Please refer to Figure 2 The internal thread 230 is close to the axial side of the steel bulkhead flange 200 away from the screw hole 211, and the pressure measuring hole 220 is distributed in the area between the screw hole 211 and the internal thread 230.

[0046] In some embodiments, see Figure 4 In the flange connection between the steel bulkhead flange 200 and the transition flange 130, a stud is used as the stud 210 for connection. The stud is threadedly connected to the steel bulkhead flange 200 at the screw hole 211. The stud is installed with a nut 212. The nut 212 is tightened on the stud. The nut 212 is pressed against the transition flange 130, and the seal 400 between the transition flange 130 and the steel bulkhead flange 200 is in an elastically compressed state.

[0047] In some embodiments, an electrical insulation assembly 500 is installed between the steel bulkhead flange 200 and the transition flange 130. Figure 4 and Figure 5The electrical insulation assembly 500 includes an insulation sleeve 510 , a gasket 520 and a measuring piece 530 . The insulating sleeve 510 includes a concentrically arranged ring portion 511 and a cylindrical portion 512, one axial end of the cylindrical portion 512 is connected to the thickness side of the ring portion 511, the inner hole of the ring portion 511 is aligned with the inner hole of the cylindrical portion 512, the ring portion 511 and the cylindrical portion 512 are both sleeved on the outside of the stud 210, the cylindrical portion 512 is attached to the inner wall of the flange hole of the transition flange 130, the ring portion 511 is arranged outside the flange hole of the transition flange 130, the gasket 520 is sleeved on the outside of the stud 210, the gasket 520 is arranged between the ring portion 511 and the nut 212 installed on the stud 210, the measuring piece 530 is sleeved on the outside of the stud 210, and the measuring piece 530 is arranged between the ring portion 511 and the transition flange 130. When the nut 212 is tightened, the nut 212, the gasket 520, the ring portion 511, the measuring piece 530 and the transition flange 130 are pressed tightly in sequence.

[0048] The electrical insulation assembly 500 shown above allows for electrical insulation between the transition flange 130 and the steel bulkhead flange 200 at the stud 210 connection. One side of the measuring piece 530 contacts the transition flange 130 of the titanium alloy flow body 100, while the other side of the measuring piece 530 contacts the stud joint. The stud joint directly contacts the steel bulkhead flange 200. The measuring piece 530 in the electrical insulation assembly 500 is used to connect to an external multimeter to test the electrical insulation performance of the transition flange 130 and the steel bulkhead flange 200, ensuring electrical isolation at the stud 210 connection.

[0049] The present application also protects a hull welding structure, which has the above-mentioned through-tank pipe installed on the bulkhead 20, or the above-mentioned through-tank pipe installed on the deck, or the above-mentioned through-tank pipe installed on both the bulkhead 20 and the deck. The two end flanges 120 of the titanium alloy flow-through body 100 in the through-tank pipe are respectively connected to the titanium alloy pipeline, which avoids the defect of weld failure in the titanium and steel welding scheme, and avoids the hazard of galvanic corrosion caused by contact between dissimilar metals when the steel through-tank fitting is connected to the titanium alloy pipeline in the traditional scheme, and correspondingly maintains the beneficial effect of the watertightness of the bulkhead 20 and the deck.

[0050] about Figure 4 The present application provides an assembly method to overcome possible doubts during the assembly process. In the formal description of the assembly method, an end flange 120 is first defined to simplify the relevant description. Specifically, please refer to Figure 1 and Figure 4 The end flange 120 located on the side of the boss 140 away from the transition flange 130 is defined as the first end flange 121. The assembly method provided by the present application is mainly different from the conventional method in that the installation sequence of the first end flange 121 is different from the conventional method.

[0051] Specifically, first, the other parts of the titanium alloy flow-through body 100 except the first end flange 121 are welded together, including welding the other end flange 120, the transition flange 130 and the boss 140 to the pipe body 110, thereby forming a first assembly state.

[0052] In the first assembly state, O-rings serving as seals 400 are respectively installed in the first groove 322 of the barrel 320, the second groove 141 of the boss 140, and the third groove 240 of the steel bulkhead flange 200. The steel bulkhead flange 200 and the threaded cap 300 are then sequentially inserted into the pipe body 110, and the studs 210 are connected between the steel bulkhead flange 200 and the transition flange 130. When the studs 210 are installed, the aforementioned electrical insulation assembly 500 is also assembled. The threaded cap 300 is then threadedly connected to the steel bulkhead flange 200 and tightened.

[0053] After threaded cap 300 is tightened, compressed air is injected into the internal cavity through pressure-testing hole 220. A pressure gauge is connected to the pressure-testing connector to measure the internal cavity's pressure and verify its sealing performance. If the sealing performance test fails, the connection between stud 210 and the threaded connection is adjusted again, and pressure testing is performed again after adjustment until the sealing performance test passes. The through-hole pipe fitting is now in the second assembled state.

[0054] In the second assembly state, the first end flange 121 is welded to the end position of the pipe body 110. At this time, the through-tank pipe fitting is in the third assembly state.

[0055] In the third assembly state, the tube body 110 of the titanium alloy flow-through body 100 is sealed by using a blind plate to seal the first end flange 121 and injecting compressed air from the other end flange 120 to check whether the pressure is maintained.

[0056] After the sealing test is completed and it is determined that the through-tank pipe fitting can be applied to the specific environment, the steel bulkhead flange 200 of the through-tank pipe fitting is welded to the preset position of the bulkhead 20 or deck, and the through-tank pipe fitting is subsequently connected to the titanium alloy pipeline, realizing the implementation method of the titanium alloy pipeline passing through the steel bulkhead 20 or deck.

[0057] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0058] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0059] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A through-tank pipe fitting, characterized in that: include: The titanium alloy flow-through body comprises a tube body, two end flanges, a transition flange and a shoulder. The two end flanges are respectively connected to the axial ends of the tube body. The transition flange and the shoulder are spaced apart from each other and are fixedly sleeved on the outside of the tube body. a steel bulkhead flange, spaced and sleeved outside the tube body, the steel bulkhead flange being connected to the transition flange via studs, the inner diameter of the steel bulkhead flange being larger than the outer diameter of the boss, and the steel bulkhead flange being used for welding to the bulkhead or deck; A threaded cover, comprising a concentrically arranged annular cover body and a cylindrical body, wherein one axial end of the cylindrical body is connected to one thick side of the annular cover body, the annular cover body is sleeved between the boss and the steel bulkhead flange, and the cylindrical body is threadedly connected to the steel bulkhead flange; Wherein, seals are installed between the transition flange and the steel bulkhead flange, between the cylinder and the steel bulkhead flange, and between the annular cover plate and the boss.

2. The through-tank pipe fitting according to claim 1, characterized in that: The steel bulkhead flange is provided with radially distributed pressure measuring holes, one end of which is connected to the inner circumference of the steel bulkhead flange. The pressure measuring holes avoid the cylinder, and a pressure measuring joint is installed on the pressure measuring holes.

3. The through-tank pipe fitting according to claim 2, characterized in that: The steel bulkhead flange is provided with a plurality of screw holes for stud connection with the flange holes of the transition flange, and the screw holes are provided on one axial side of the steel bulkhead flange; The steel bulkhead flange is provided with an internal thread on the inner circumference thereof, the internal thread being connected to the external thread of the cylinder, and the internal thread being close to an axial side of the steel bulkhead flange away from the screw hole; The pressure measuring holes are distributed in the area between the screw hole and the internal thread.

4. The through-tank pipe fitting according to claim 3, characterized in that: An electrical insulation assembly is installed between the steel bulkhead flange and the transition flange, and the electrical insulation assembly includes: An insulating sleeve comprising a concentrically arranged ring portion and a cylindrical portion, wherein one axial end of the cylindrical portion is connected to the thickness side of the ring portion, the inner hole of the ring portion is aligned with the inner hole of the cylindrical portion, the ring portion and the cylindrical portion are both sleeved outside the stud, the cylindrical portion is attached to the inner wall of the flange hole of the transition flange, and the ring portion is arranged outside the flange hole of the transition flange; a washer, sleeved on the outside of the stud, the washer being arranged between the ring portion and a nut mounted on the stud; A measuring piece is sleeved on the outside of the stud, and the measuring piece is arranged between the ring portion and the transition flange; Wherein, when the nut is tightened, the nut, the gasket, the ring portion, the measuring piece and the transition flange are tightened in sequence.

5. The through-tank pipe fitting according to any one of claims 1 to 4, characterized in that: The connection position between the cylinder and the annular cover is located between the inner and outer circumferences of the annular cover; The cylinder is provided with a first groove, which is distributed along the entire circumferential circle of the cylinder. The first groove is located on the outer circumference of the cylinder. The first groove is located between the external thread of the cylinder and the annular cover plate. The sealing member installed in the first groove abuts against the steel bulkhead flange to achieve sealing between the cylinder and the steel bulkhead flange.

6. The through-tank pipe fitting according to any one of claims 1 to 4, characterized in that: The connection position between the cylinder and the annular cover is located between the inner and outer circumferences of the annular cover; The boss is provided with a second groove, which is distributed along the entire circumference of the boss. The second groove is provided on the side of the boss away from the transition flange. The sealing member installed in the second groove abuts against the annular cover plate to achieve sealing between the annular cover plate and the boss.

7. The through-tank pipe fitting according to any one of claims 1 to 4, characterized in that: The steel bulkhead flange is provided with a third groove, which is distributed along the entire circumferential circle of the steel bulkhead flange. The third groove is provided at the axial end of the steel bulkhead flange adjacent to the transition flange. The sealing member installed in the third groove abuts against the transition flange to achieve sealing between the transition flange and the steel bulkhead flange.

8. The through-tank pipe fitting according to claim 1, characterized in that: The titanium alloy flow-through body is made of the same material as the titanium alloy pipeline connected to the end flange; The steel bulkhead flange is made of the same material as the bulkhead or deck welded to the steel bulkhead flange.

9. A hull welding structure, characterized in that: A through-tank pipe fitting according to any one of claims 1 to 8 is installed on the bulkhead and / or deck, and two end flanges of the titanium alloy flow-through body in the through-tank pipe fitting are respectively connected to titanium alloy pipelines.

10. An assembly method, characterized in that: For assembling to form a through-tank pipe fitting according to any one of claims 1 to 8, the one of the two end flanges located on the side of the boss away from the transition flange is the first end flange, and the assembly method comprises: When the pipe body is not equipped with the first end flange, the steel bulkhead flange and the threaded cover are sequentially inserted into the pipe body; After the pipe body is inserted, the steel bulkhead flange and the transition flange are connected by studs, and the threaded cover is connected to the steel bulkhead flange by threads; After the stud connection and the threaded connection are completed, the first end flange is welded to the pipe body.

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