Marine anti-corrosion cooling maintainable exhaust pipe cabin penetrating piece

Abstract

The invention discloses a marine anti-corrosion cooling maintainable exhaust pipe cabin penetrating piece, relates to the technical field of ship exhaust systems, and aims to solve the problems that an existing cabin penetrating piece is serious in seawater corrosion and inconvenient to maintain. The cabin penetrating piece comprises an inner pipe, an outer pipe, an end face sealing plate, a sealing flange and an anti-corrosion zinc piece. An exhaust channel is formed in the inner pipe, the inner pipe penetrates through the outer pipe, a seawater flowing cavity is formed between the inner pipe and the outer pipe, and the outer pipe is provided with a water inlet pipe and a water outlet pipe which are communicated with the seawater flowing cavity; the end face sealing plate is arranged on the left side of the outer pipe and attached to the outer wall of the inner pipe and the left side wall face of the outer pipe in a sealed mode. A connecting flange is arranged on the right side of the outer pipe and detachably connected with a sealing flange, and the sealing flange is attached to the outer wall of the inner pipe and the right side wall face of the outer pipe in a sealed mode. And the anti-corrosion zinc piece is arranged in the seawater flowing cavity and is fixed with the sealing flange. Cooling is achieved through the seawater flowing cavity, corrosion is inhibited through the anti-corrosion zinc piece, maintenance is simplified through the detachable sealing flange, the device is suitable for a ship exhaust system, the service life can be prolonged, and operation and maintenance convenience can be improved.

Description

Technical Field

[0001] This invention relates to the field of marine exhaust technology, and in particular to a marine corrosion-resistant, cooling, and maintainable exhaust pipe through-hull component. Background Technology

[0002] In the design of exhaust passages for marine propulsion systems, the exhaust pipe penetration component is a core transitional component for enabling the cross-compartment transport of exhaust gas. Its performance directly affects the airtightness, structural safety, and thermal management efficiency of the ship's compartments. Since the high-temperature exhaust gas flowing through the ship's exhaust pipes needs to pass through compartments with different functions, to avoid thermal damage to the bulkhead structure, prevent heat crosstalk between compartments, and ensure personnel safety, existing technologies generally employ a double-layer pipe structure with an inner and outer pipe as the core of the exhaust pipe penetration component. The design logic of this double-layered tube structure revolves around "high-efficiency heat exchange" and "structural protection": the inner tube, serving as a flow channel for high-temperature exhaust gas, is made of high-temperature resistant alloy material to withstand the scouring and high-temperature corrosion of the exhaust gas; a closed annular chamber is formed between the outer and inner tubes. During ship operation, seawater from the ship's cooling system is introduced as a cooling medium, allowing the seawater to continuously flow within the annular chamber. Through direct heat exchange between the seawater and the outer wall of the inner tube, the high-temperature heat transferred by the inner tube can be quickly removed. However, in long-term practical application, this traditional double-layer tube-through-tank component has revealed significant operational and maintenance defects, mainly concentrated in two aspects: "seawater corrosion" and "maintenance difficulties caused by structural integration." On the one hand, the seawater used in the ship's cooling system contains high concentrations of chloride ions, sulfates, and microorganisms. Even if the outer and inner tubes are made of corrosion-resistant steel (such as 316L stainless steel), long-term exposure to seawater immersion, alternating wet and dry conditions, and electrochemical effects can easily lead to pitting corrosion, crevice corrosion, and localized rusting on the inner wall of the tube. The corrosion is particularly severe at the inlet, outlet, and welded joints of the annular chamber. As the service life increases, the tube thickness gradually decreases, which not only affects heat exchange efficiency but may also cause seawater leakage, resulting in secondary damage to the ship's internal equipment and structure. On the other hand, to ensure the sealing performance and structural strength between the through-tank component and the tank wall, existing double-layer tube-through-tank components are usually rigidly connected to the ship's tank wall using a full-circumference welding process, forming an inseparable integrated structure between the through-tank component and the tank wall. When the pipe body needs maintenance or replacement due to corrosion, wear or leakage, the welded parts of the bulkhead must be cut first, the old parts removed, and new parts made and then welded, inspected and sealed. The whole maintenance process is complicated and time-consuming. The cutting and welding operations can easily damage the bulkhead structure. At the same time, it takes up the ship's dock repair or downtime, which leads to a significant increase in the ship's operating costs. The convenience and economy of maintenance need to be improved. Summary of the Invention

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a marine corrosion-resistant, cooling, and maintainable exhaust pipe through-hull component.

[0004] A marine corrosion-resistant, cooling, and maintainable exhaust pipe through-bay component designed for this purpose includes an inner pipe, an outer pipe, an end face plate, a sealing flange, and corrosion-resistant zinc parts. The inner tube forms a through-flow exhaust channel. The inner tube passes through the outer tube and both extend to the left and right; a seawater flow cavity is formed between the inner tube and the outer tube; the outer tube is provided with an inlet pipe and an outlet pipe that are connected to the seawater flow cavity. The end face sealing plate is disposed on the left side of the outer tube; the end face sealing plate is fitted to the outer wall of the inner tube and is fitted and sealed to the left side wall of the outer tube; The sealing flange is located on the right side of the outer tube and is detachably connected to the outer tube; the sealing flange is fitted against the outer wall of the inner tube and is fitted against and sealed against the left side wall of the outer tube; The anti-corrosion zinc component is installed inside the seawater flow cavity and is fixedly connected to the sealing flange.

[0005] Preferably, a connecting flange is provided on the right side of the outer tube, and the sealing flange is connected to the connecting flange.

[0006] Preferably, the inner wall of the sealing flange is provided with a sealing ring that fits and seals against the outer wall of the inner tube.

[0007] Preferably, the sealing flange consists of two semi-circular flange pieces; connecting lugs are provided at both ends of the semi-circular flange pieces; When two semi-circular flanges are combined to form a sealing flange, locking bolts are locked into the two adjacent connecting lugs.

[0008] Preferably, the anti-corrosion zinc component is fixedly mounted on the semi-circular flange.

[0009] Preferably, a sealing gasket is provided between the sealing flange and the connecting flange.

[0010] Preferably, the left and right ends of the inner tube are fixedly connected with pipe flanges.

[0011] Preferably, a plurality of the anti-corrosion zinc parts are provided and fixed on the wall surface of the sealing flange facing the seawater flow cavity.

[0012] Preferably, the end face sealing plate is welded and fixed to the inner tube and the outer tube.

[0013] Preferably, the outer tube is welded and fixed to the connecting flange.

[0014] Compared with existing technologies, this invention incorporates anti-corrosion zinc components within the seawater flow cavity. Leveraging the higher electrochemical activity of zinc compared to the pipe material, the zinc components preferentially act as the anode, undergoing an oxidation reaction. This provides cathodic protection for the main structure, including the inner and outer pipes, effectively inhibiting pitting and crevice corrosion caused by chloride ions and sulfates in the seawater environment. Furthermore, the anti-corrosion zinc components are fixedly connected to the sealing flange, allowing for convenient replacement during flange disassembly. This prevents protective failure due to zinc component depletion, further extending the overall service life of the penetration components and facilitating maintenance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the planar structure of the present invention; Figure 2 This is a partial cross-sectional structural diagram of the present invention; Figure 3 This is a schematic diagram of the sealing flange. Figure 4 This is a schematic diagram of the assembly of the sealing flange and the corrosion-resistant zinc parts. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] See Figures 1-4 A marine corrosion-resistant, cooling, and maintainable exhaust pipe through-hull component includes an inner pipe 10, an outer pipe 20, an end face sealing plate 30, a sealing flange 70, and a corrosion-resistant zinc component 80. The inner pipe 10 forms a through-duct for exhausting both sides. The inner pipe 10 passes through the outer pipe 20, and both extend to the left and right. A seawater flow cavity 100 is formed between the inner pipe 10 and the outer pipe 20. The outer pipe 20 is provided with an inlet pipe 510 and an outlet pipe 520 that communicate with the seawater flow cavity 100. The end-face sealing plate 30 is disposed on the left side of the outer tube 20; the end-face sealing plate 30 is fitted to the outer wall of the inner tube 10 and is fitted and sealed to the left side wall of the outer tube 20; the sealing flange 70 is disposed on the right side of the outer tube 20 and is detachably connected to the outer tube 20; the sealing flange 70 is fitted to the outer wall of the inner tube 10 and is fitted and sealed to the left side wall of the outer tube 20; the anti-corrosion zinc part 80 is disposed in the seawater flow cavity 100 and is fixedly connected to the sealing flange 70.

[0018] The operating principle of this ship's corrosion-resistant, cooling, and maintainable exhaust pipe penetration component is as follows: In the exhaust gas transport and basic circulation process, the inner pipe 10 serves as the core exhaust channel. Its internal structure, which runs through both sides, can directly receive the high-temperature exhaust gas generated by the ship's power system. The high-temperature exhaust gas flows from left to right along the exhaust channel of the inner pipe 10, realizing the exhaust gas export across compartments and providing a passage for the normal exhaust of the ship's power system. At the same time, the inner pipe 10 passes through the outer pipe 20 and both extend in the left and right direction, so that the inner pipe 10 and the outer pipe 20 naturally form an annular seawater flow cavity 100. This cavity provides a dedicated space for subsequent seawater cooling and corrosion protection, avoiding direct contact between the high-temperature exhaust gas and the external structure. In the seawater cooling and thermal protection process, the inlet pipe 510 and outlet pipe 520 on the outer pipe 20 are respectively connected to the seawater pipeline of the ship's cooling system. When the ship is running, cooling seawater is continuously injected into the seawater flow chamber 100 through the inlet pipe 510. Since the seawater flow chamber 100 is doubly sealed by the end face sealing plate 30 and the sealing flange 70 (the end face sealing plate 30 is attached to the outer wall of the inner pipe 10 and the left side wall of the outer pipe 20, and the sealing flange 70 is attached to the outer wall of the inner pipe 10 and the right side wall of the outer pipe 20), the injected seawater can form a closed and continuously flowing circulation in the chamber. The path is fully in contact with the outer wall of the inner tube 10. At this time, the temperature of the inner tube 10 rises due to the transport of high-temperature exhaust gas. The heat of its outer wall is transferred to the cooling seawater in the seawater flow cavity 100 through heat conduction. The heated seawater is then discharged through the outlet pipe 520 and flows back to the ship's cooling system, completing one heat exchange cycle. Through the continuous flow and heat exchange of seawater, the temperature of the outer wall of the inner tube 10 can be stably controlled within a safe range, avoiding thermal damage to the bulkhead and surrounding equipment caused by high temperature, while preventing abnormal rise in the temperature inside the compartment, thus realizing the cooling and protection function of the trans-bucket components. In the seawater corrosion protection process, the anti-corrosion zinc component 80 installed in the seawater flow cavity 100 plays a crucial role: Since the anti-corrosion zinc component 80 is fixedly connected to the sealing flange 70, after seawater is injected into the seawater flow cavity 100, the anti-corrosion zinc component 80 is completely immersed in seawater; based on the principle of electrochemical corrosion, the electrode potential of zinc is lower than that of the metal materials used in the inner pipe 10 and the outer pipe 20. In the seawater medium, the anti-corrosion zinc component 80 will preferentially act as the anode to undergo oxidation reaction (i.e., "sacrificial anode"), continuously releasing electrons. Through electron transfer, it inhibits the cathodic reduction reaction on the outer wall of the inner pipe 10 and the inner wall of the outer pipe 20, thereby preventing pitting corrosion and crevice corrosion of the pipe material by seawater; at the same time, the fixed connection between the anti-corrosion zinc component 80 and the sealing flange 70 ensures that its position in the seawater flow cavity 100 is stable, continuously forming anti-corrosion protection for the entire area of ​​the seawater flow cavity 100, especially the water flow impact areas of the inlet pipe 510 and the outlet pipe 520, extending the service life of the pipe material.

[0019] In the maintenance operation adaptation phase, the detachable connection structure between the sealing flange 70 and the outer pipe 20 facilitates maintenance: when it is necessary to inspect or clean the inside of the seawater flow cavity 100, or replace the worn-out anti-corrosion zinc parts 80, there is no need to damage the connection structure between the through-hole component and the bulkhead. Only the connecting parts (such as bolts) between the sealing flange 70 and the outer pipe 20 need to be disassembled, and the anti-corrosion zinc parts 80, which are fixed together with the sealing flange 70, can be removed from the right side of the outer pipe 20, directly exposing the inside of the seawater flow cavity 100. Maintenance personnel can use this opening to complete operations such as replacing the anti-corrosion zinc parts 80, cleaning corrosion on the inner wall of the cavity, and checking the patency of the inlet pipe 510 / outlet pipe 520. After maintenance, simply reconnect and fix the sealing flange 70 to the outer pipe 20 to ensure that it is in close contact with the outer wall of the inner pipe 10 and the right side wall of the outer pipe 20, and the normal use of the through-hole component can be restored. The entire process does not require cutting or welding, achieving convenient and efficient maintenance.

[0020] See Figure 1 and Figure 2 A connecting flange 60 is provided on the right side of the outer tube 20, and the sealing flange 70 is connected to the connecting flange 60. The core function of the connecting flange 60 is to provide a fitting carrier for the connection between the sealing flange 70 and the outer tube 20. The outer tube 20 and the connecting flange 60 can be welded together. The sealing flange 70 is provided with a first flange hole 710 corresponding to the connecting flange 60. By passing bolts through the first flange hole 710 and then through the flange hole of the connecting flange 60, the sealing flange 70 and the connecting flange 60 can be locked together by tightening with nuts and bolts.

[0021] See Figures 2 to 3 The inner wall of the sealing flange 70 is provided with a sealing ring 910 that fits and seals against the outer wall of the inner tube 10. The core function of the sealing ring 910 is to enhance the sealing fit between the sealing flange 70 and the outer wall of the inner tube 10, and to prevent seawater in the seawater flow cavity 100 from leaking through the gap between the sealing flange 70 and the inner tube 10.

[0022] See Figure 3The sealing flange 70 is composed of two semi-circular flange pieces 700. Connecting lugs 730 are provided at both ends of each semi-circular flange piece 700. When the two semi-circular flange pieces 700 are combined to form the sealing flange 70, locking bolts 740 are locked into the adjacent connecting lugs 730. The sealing flange 70 adopts a design combining two semi-circular flange pieces 700, coupled with the locking structure of connecting lugs 730 and locking bolts 740 at both ends. Its core advantage lies in significantly improving the ease of disassembly and assembly, providing efficient support for maintenance operations: during disassembly, only the locking bolts 740 on the adjacent connecting lugs 730 need to be unscrewed to separate the two semi-circular flange pieces 700 from the outer wall of the inner tube 10, without the need for complex disassembly of the overall structure; during assembly, the two semi-circular flange pieces 700 are spliced ​​against the outer wall of the inner tube 10, and quickly fixed by locking the connecting lugs 730 with the locking bolts 740, achieving convenient disassembly and assembly of the sealing flange 70. This design avoids the reliance on surrounding structures when disassembling and assembling traditional integral flanges, and can more efficiently expose the seawater flow cavity 100, saving time for maintenance operations such as replacement of anti-corrosion zinc parts 80 and cavity cleaning, and further improving the convenience of maintenance of the through-cabin parts.

[0023] In this invention, the anti-corrosion zinc component 80 is fixedly mounted on the semi-circular flange component 700. Fixing the anti-corrosion zinc component 80 on the semi-circular flange component 700 fully utilizes the convenient disassembly and assembly characteristics of the semi-circular flange component, achieving multiple practical benefits: Firstly, when assembling the sealing flange, the anti-corrosion zinc component, which is simultaneously placed into the seawater flow cavity along with the semi-circular flange component, can be quickly positioned and installed without the need for an additional separate fixing process, simplifying the assembly process; secondly, when the anti-corrosion zinc component needs to be replaced due to the sacrificial anode effect, only the semi-circular flange component needs to be disassembled to remove the old anti-corrosion zinc component, and the new component can be replaced and reset together with the semi-circular flange component, without needing to operate deep inside the seawater flow cavity, significantly reducing the difficulty and time required for replacement.

[0024] See Figure 2 A sealing gasket 920 is provided between the sealing flange 70 and the connecting flange 60. The sealing gasket 920 plays a crucial sealing and protective role: on the one hand, it can fill the tiny gaps between the mating surfaces of the two flanges, preventing seawater in the seawater flow cavity from leaking from the flange connection, while preventing external impurities from entering the seawater flow cavity and affecting the heat exchange and corrosion protection effect; on the other hand, it can buffer the pressure and vibration when the two flanges are connected, reduce the wear of the flange mating surfaces caused by the turbulence of ship navigation, maintain long-term sealing reliability, and provide an important guarantee for the stable operation of the transom components.

[0025] In this invention, pipe flanges 40 are fixedly connected to both ends of the inner tube 10. The pipe flanges 40 are the core connecting components for connecting the through-hull parts to the ship's main exhaust pipe. The assembly of the ship's main exhaust pipe can be quickly achieved through the connection of flanges.

[0026] In this invention, a plurality of anti-corrosion zinc parts 80 are provided and fixed on the wall surface of the sealing flange 70 facing the seawater flow cavity 100.

[0027] In this invention, the sealing flange 70 is provided with a second flange hole 720. The anti-corrosion zinc component 80 is provided with a through hole corresponding to the second flange hole 720. The sealing flange 70 and the anti-corrosion zinc component 80 can be quickly fixed by passing a bolt through the through hole and threading it into the second flange hole 720.

[0028] In this invention, the end face sealing plate 30 is welded and fixed to the inner tube 10 and the outer tube 20. Of course, the end face sealing plate 30 can also be connected to the inner tube 10 and the outer tube 20 by means of a flange connection, and waterproof components such as sealing rings can be added to ensure sealing performance according to different connection requirements.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. The terms "first" and "second" 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.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component, characterized in that: Includes inner tube (10), outer tube (20), end face sealing plate (30), sealing flange (70) and anti-corrosion zinc parts (80); The inner tube (10) forms a left-right through exhaust channel inside; The inner tube (10) passes through the outer tube (20) and both extend to the left and right; a seawater flow cavity (100) is formed between the inner tube (10) and the outer tube (20); the outer tube (20) is provided with an inlet pipe (510) and an outlet pipe (520) that are connected to the seawater flow cavity (100). The end face sealing plate (30) is disposed on the left side of the outer tube (20); the end face sealing plate (30) is attached to the outer wall of the inner tube (10) and is attached to and sealed to the left side wall of the outer tube (20); The sealing flange (70) is located on the right side of the outer tube (20) and is detachably connected to the outer tube (20); the sealing flange (70) is fitted to the outer wall of the inner tube (10) and is fitted to and sealed to the left side wall of the outer tube (20); The anti-corrosion zinc component (80) is disposed in the seawater flow cavity (100) and fixedly connected to the sealing flange (70).

2. The marine corrosion-resistant, cooling, and maintainable exhaust pipe through-bay component according to claim 1, characterized in that: A connecting flange (60) is provided on the right side of the outer tube (20), and the sealing flange (70) is connected to the connecting flange (60).

3. The marine corrosion-resistant, cooling, and maintainable exhaust pipe through-bay component according to claim 1, characterized in that: The inner wall of the sealing flange (70) is provided with a sealing ring (910) that fits and seals against the outer wall of the inner tube (10).

4. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component according to claim 1, characterized in that: The sealing flange (70) consists of two semi-circular flange pieces (700); connecting lugs (730) are provided at both ends of the semi-circular flange pieces (700). When two semi-circular flanges (700) are combined to form a sealing flange (70), locking bolts (740) are locked into the two adjacent connecting lugs (730).

5. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component according to claim 4, characterized in that: The anti-corrosion zinc part (80) is fixedly mounted on the semi-circular flange part (700).

6. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component according to claim 2, characterized in that: A sealing gasket (920) is provided between the sealing flange (70) and the connecting flange (60).

7. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component according to claim 1, characterized in that: The inner tube (10) is fixedly connected to the left and right ends with pipe flanges (40).

8. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component according to claim 1, characterized in that: The anti-corrosion zinc parts (80) are provided in several units and fixed on the wall surface of the sealing flange (70) facing the seawater flow cavity (100).

9. A marine corrosion-resistant, cooling, and maintainable exhaust pipe penetration component according to claim 1, characterized in that: The end face sealing plate (30) is welded and fixed to the inner tube (10) and the outer tube (20).

10. A marine corrosion-resistant, cooling, maintainable exhaust pipe penetration component according to claim 2, characterized in that: The outer tube (20) is welded and fixed to the connecting flange (60).

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