Exhaust muffler for marine twin-turbo multi-cylinder diesel engines

Abstract

This invention discloses an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine, belonging to the technical field of muffler devices. Two identical branch exhaust pipes are arranged inside the outer casing. Each branch exhaust pipe includes a spiral section connected to an external elbow with a straight end pipe. The spiral section is connected to a straight section via an internal elbow. The two branch exhaust pipes are arranged mirror images of each other, with their internal elbows aligned and one straight section inserted into the other. The portion of the straight end pipe extending out of the outer casing connects to the portion of the straight section extending out of the outer casing on the same side. The two internal elbows are connected. A perforated exhaust slit is provided on the side of the spiral section facing the inner wall of the outer casing. A cooling device is also provided on the inner side of the spiral section. This invention integrates low-frequency silencing, spark extinguishing, and exhaust cooling. It extinguishes sparks and collects them using a slit, forming an HQ pipe structure that significantly attenuates low-frequency noise. Cooling reduces exhaust volume, flow rate, and velocity, improving the low-frequency silencing effect.

Description

Technical Field

[0001] This invention relates to the field of silencer technology, and in particular to an exhaust silencer for a marine dual-exhaust turbine multi-cylinder diesel engine. Background Technology

[0002] The exhaust system of a marine dual-exhaust turbojet engine directly affects the engine's power, economy, reliability, and stealth. With increasing demands for noise reduction and infrared stealth capabilities, the functional integration of exhaust systems is also improving. In existing technologies, the two branch exhaust pipes of a marine dual-exhaust turbojet engine are typically parallel and independently arranged straight pipes. Their internal noise reduction structures are often labyrinths or baffles, resulting in high airflow resistance and ineffective attenuation of low-frequency noise. Using traditional expansion chamber mufflers to silence the dominant low-frequency noise requires extremely long chambers, further increasing the occupied volume. Furthermore, sparks carried by the exhaust gas pose a fire hazard. Therefore, existing technologies incorporate independent spark extinguishers within the branch exhaust pipes to extinguish sparks. These spark extinguishers are often rotating blades that utilize the cyclone generated by rotation to extinguish sparks and disperse the extinguished particulate matter. However, this kind of spark extinguishing method has several drawbacks. First, it requires a separate spark extinguisher, leading to a bulky overall structure. Second, the accumulated particulate matter after extinguishing can cause carbon buildup in the branch exhaust pipe, resulting in reduced or no spark extinguishing function, reduced or no muffler effect, and increased exhaust resistance. Furthermore, the cooling and muffler devices in existing exhaust systems are independent, making it impossible to improve acoustic performance using cooling devices. The original exhaust noise of marine twin-turbocharged diesel engines is concentrated at low frequencies, resulting in high sound pressure levels. The exhaust temperature of marine twin-exhaust turbo diesel engines reaches 300–600°C, generating strong heat radiation, increasing the volumetric flow rate and velocity of the exhaust gas, and producing regenerated airflow noise.

[0003] Therefore, existing technologies face a comprehensive challenge due to multiple requirements, including low-frequency noise reduction, spark extinguishing, exhaust cooling, compact structure, and independent exhaust for dual turbines. Summary of the Invention

[0004] The purpose of this invention is to provide an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine to solve the problems existing in the prior art. It integrates low-frequency noise reduction, spark extinguishing, and exhaust cooling into one unit. This is achieved by spirally winding two branch exhaust pipes together to form an integrated spiral pipeline. The swirling flow extinguishes sparks, and slits are opened on the outer wall to collect them. Furthermore, the morphology of the branch exhaust pipes is optimized to form an HQ pipe structure to significantly attenuate low-frequency noise. Simultaneously, the cooling device is rationally utilized within the available space inside the branch exhaust pipes, providing direct or indirect cooling at different locations. This cooling reduces exhaust volume and flow velocity, increasing the equivalent noise travel distance and allowing the noise to travel within the branch exhaust pipes for a longer period, further enhancing the low-frequency noise reduction effect. This achieves a compact structure, synergistic functions, reduced system complexity and cost, and improved low-frequency noise control performance.

[0005] To achieve the above objectives, the present invention provides the following solution: This invention provides an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine, comprising a housing with two identical branch exhaust pipes inside. Each branch exhaust pipe includes a helical section, which is a rectangular section scanned along a spatial helix passing through the geometric center of the rectangle and with its tangent perpendicular to the rectangle. The long side of the rectangle is parallel to the axis of the spatial helix, the pitch of the spatial helix is ​​fixed and greater than the length of the long side of the rectangle, and the diameter of the spatial helix is ​​fixed and greater than the length of the short side of the rectangle. The first end of the helical section connects to the first end of an external elbow, and the second end of the external elbow is a straight pipe with its axis parallel to the axis of the spatial helix. The second end of the helical section connects to the first end of the straight pipe section via an internal elbow, the axis of which is also parallel to the axis of the spatial helix. The extension direction of the axis is the projection of the branch exhaust pipe onto the plane of the frontal view. The projected outline of the end pipe coincides with the projected outline of the straight pipe section, and the projected outline of the end pipe is located in the inner circle of the projected outline of the spiral pipe section. The two branch exhaust pipes are arranged in mirror image, the inner elbows of the two branch exhaust pipes are aligned, and one straight pipe section is inserted into the other branch exhaust pipe. The part of the straight end pipe extending out of the outer shell is connected to the part of the straight pipe section extending out of the outer shell on the same side. The two inner elbows are connected. A hollow discharge slot is provided on the side of the spiral pipe section facing the inner wall of the outer shell. A cooling device is also provided on the inner side of the spiral pipe section. The straight pipe section passes through the cooling device, and there is a gap between the outer wall of the cooling device and the spiral pipe section. The difference between the length of the spatial spiral and the length of the straight pipe section is ΔL. , where n is an integer order, n takes the values ​​0, 1, 2, 3, ..., c is the speed of sound in the medium, and f0 is the frequency to be silenced.

[0006] In one embodiment, the outer shell is a cylindrical structure.

[0007] In one implementation, the spatial helix is ​​right-handed and has four turns.

[0008] In one embodiment, the cooling device is a cooling water jacket, with a cooling water jacket provided on the inner side of each spiral tube section, and two cooling water jackets connected in series through a pipeline. Each cooling water jacket is provided with an inlet pipe and an outlet pipe, with the ends of the inlet pipe and the outlet pipe extending out of the outer shell.

[0009] In one embodiment, the shape of the cooling water jacket matches the spatial shape of the inner side of the spiral tube segment.

[0010] In one embodiment, parallel heat dissipation fins are arranged along the axial direction on the inner wall of the cooling water jacket.

[0011] In one embodiment, in the working state, the axis of the spiral tube segment is perpendicular to the placement plane, one end of the outer casing extending from the inlet pipe and the outlet pipe is away from the placement plane, and the straight end pipe and the straight tube segment on the same side as the inlet pipe are respectively connected to separate exhaust gas turbines.

[0012] In one embodiment, the inner wall of the spiral tube segment is provided with a composite sound-absorbing material layer.

[0013] In one embodiment, the composite sound-absorbing material layer is made of aluminum silicate fiber, foam ceramic, and / or basalt sound-absorbing cotton.

[0014] In one embodiment, the discharge slot is rectangular, and the length direction of the discharge slot is parallel to the axis of the spiral tube segment. Two opposing discharge slots are provided on each turn, and the center lines of the two discharge slots, the axis of the straight end tube, and the axis of the straight tube segment are coplanar. The length of the discharge slot is equal to the length of the tube body of the spiral tube segment in the direction parallel to the axis of the spiral tube segment, and the width of the discharge slot is 0.6 mm to 2.36 mm.

[0015] The present invention achieves the following technical effects compared to the prior art: This invention provides an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine, integrating spark extinguishing, low-frequency noise reduction, and exhaust cooling. Each branch exhaust pipe has a spiral section, which creates a swirling flow upon entry of noise-carrying exhaust gas, extinguishing sparks without the need for a separate spark extinguisher. Exhaust particles are discharged through the exhaust gaps, minimizing the source of carbon buildup in the pipe and effectively reducing carbon buildup and extending the time before it appears. Two branch exhaust pipes are spirally intertwined to form an integrated spiral pipe system. The structure of the branch exhaust pipes is further adjusted based on the spiral section, and an HQ pipe structure is formed by setting three connecting points to significantly attenuate low-frequency noise. The cooling device reduces the temperature of the branch exhaust pipes, especially the straight sections, thereby reducing exhaust volume flow and velocity, increasing the equivalent travel distance of the noise, and allowing the noise to travel in the branch exhaust pipes for a longer period, further improving the low-frequency noise reduction effect. This achieves a compact structure, synergistic functions, reduced system complexity and cost, and improved low-frequency noise control performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view schematic diagram of a branch exhaust pipe in an embodiment of the present invention; Figure 2 This is a schematic diagram of the axial structure of a branch exhaust pipe in an embodiment of the present invention, with the straight end pipe as the front view direction; Figure 3 This is a front view schematic diagram of the combined structure of two branch exhaust pipes in an embodiment of the present invention; Figure 4 This is a side view of the combined structure of two branch exhaust pipes in an embodiment of the present invention. Figure 5 This is a frontal cross-sectional view of the combined structure of two branch exhaust pipes in an embodiment of the present invention. Figure 6 This is a schematic diagram of the combined structure of the cooling device in an embodiment of the present invention; Figure 7 This is a schematic diagram of the overall structure of an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to an embodiment of the present invention. Figure 8 This is a schematic diagram of the internal structure of the exhaust muffler of a marine dual-exhaust turbine multi-cylinder diesel engine according to an embodiment of the present invention. Figure 9 for Figure 8 The coloring effect diagram; Figure 10 This is a colored illustration of a cooling device.

[0018] The components include: 1. Outer shell; 2. Branch exhaust pipe; 3. Spiral pipe section; 4. Straight pipe section; 5. Inner elbow; 6. Exhaust gap; 7. Cooling device; 8. Heat dissipation fins. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. 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.

[0020] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. In the description of this invention, it should be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are merely for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0021] It should also be noted that in the embodiments of this application, the same reference numerals are used to denote the same component or the same part.

[0022] The purpose of this invention is to provide an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine to solve the problems existing in the prior art. It integrates low-frequency noise reduction, spark extinguishing, and exhaust cooling into one unit. By spirally winding two branch exhaust pipes together to form an integrated spiral pipeline, it uses swirling flow to extinguish sparks and opens slits on the outer wall to collect sparks. By setting three connected positions to form an HQ pipe structure, it can significantly attenuate low-frequency noise. By using cooling to reduce exhaust volume flow rate and velocity, it can further improve the low-frequency noise reduction effect. It achieves the goals of compact structure, synergistic function, reduced system complexity and cost, and improved low-frequency noise control performance.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figures 1 to 10 As shown, this invention provides an exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine, characterized by: a housing 1, within which two identical branch exhaust pipes 2 are installed. Each branch exhaust pipe 2 includes a spiral section 3, which is a rectangular section scanned along a spatial spiral line passing through the geometric center of the rectangle and whose tangent is perpendicular to the rectangle. The long side of the rectangle is parallel to the axis of the spatial spiral line. The pitch of the spatial spiral line is fixed and greater than the length of the long side of the rectangle, and the diameter of the spatial spiral line is fixed and greater than the length of the short side of the rectangle. The first end of the spiral section 3 is connected to the first end of an external elbow. The second end of the external elbow is a straight pipe with its axis parallel to the axis of the spatial spiral line. The second end of the spiral section 3 is connected to the first end of a straight pipe section 4 via an internal elbow 5. The axis of section 4 is parallel to the axis of the spatial spiral. Projecting the branch exhaust pipe 2 onto the plane with the extension direction of the spatial spiral axis as the frontal view direction, the projected outline of the end pipe coincides with the projected outline of the straight pipe section 4, and the projected outline of the end pipe is located within the inner circle of the projected outline of the spiral pipe section 3. The two branch exhaust pipes 2 are mirror images of each other, with the inner elbows 5 of the two branch exhaust pipes 2 aligned, and one straight pipe section 4 inserted into the other branch exhaust pipe 2. The portion of the straight end pipe extending out of the outer casing 1 connects with the portion of the straight pipe section 4 extending out of the outer casing 1 on the same side. The two inner elbows 5 are connected. A perforated exhaust slit 6 is provided on the side of the spiral pipe section 3 facing the inner wall of the outer casing 1. A cooling device 7 is also provided on the inner side of the spiral pipe section 3, through which the straight pipe section 4 passes. There is a gap between the outer wall of the cooling device 7 and the spiral pipe section 3. The difference between the length of the spatial spiral and the length of the straight pipe section 4 is ΔL. , where n is an integer order, n takes the values ​​0, 1, 2, 3, ..., c is the speed of sound in the medium, and f0 is the frequency to be silenced.

[0025] The straight end pipe and straight pipe section 4 located at one end of the outer casing 1 are each connected to an independent exhaust turbine. The two noise sources interfere and cancel each other out at the point where the two branch exhaust pipes 2 connect. It should be noted that the HQ (Herschel-Quincke Tube) is an interference-type noise reduction structure, consisting of a main pipe and at least one side pipe connected to the main pipe at both ends. It utilizes the path difference between the side pipe and the main pipe to cause the sound waves of a specific frequency to interfere and cancel each other out at the confluence point. In this invention, any one branch exhaust pipe 2 serves as the main pipe, and the other branch exhaust pipe serves as the side pipe. The three connection points of the two branch exhaust pipes 2 are the interference and cancellation points of the sound waves.

[0026] It should be noted that the two-dimensional image obtained by projecting the branch exhaust pipe 2 onto the plane with the extension direction of the axis of the spatial spiral as the frontal view direction should include the planar projection outline of the spiral pipe section 3, the planar projection outline of the visible part of the outer (inner) connecting elbow, and the planar projection outline of the straight end pipe (spiral pipe section 3). The projection of the spiral pipe section 3 in this direction is a ring. The outer diameter of this ring is equal to the diameter of the spiral as the scanning path plus the length of the shorter side of each half of the rectangle as the scanning pattern. The inner diameter of the ring is equal to the diameter of the spiral as the scanning path minus the length of the shorter side of each half of the rectangle as the scanning pattern. The planar projection outline of the straight end pipe (spiral pipe section 3) is located in the inner circle of the spiral pipe section 3, that is, inside the ring.

[0027] It should be noted that the pitch of the spatial spiral is fixed and greater than the length of the long side of the rectangle to ensure that the dimensions of each layer of the spiral tube segment 3 formed by scanning are consistent and that adjacent layers do not interfere with each other.

[0028] It should be noted that after the exhaust gas is cooled, its temperature decreases, which reduces the speed at which the noise propagates. In the same propagation time, the sound can travel a shorter distance, which is equivalent to the distance being lengthened.

[0029] Compared to existing technologies, the technical approach of this application first focuses on effectively extinguishing exhaust sparks and reducing carbon deposits. The straight-pipe branch exhaust pipe 2 is modified to have a spiral structure that can directly generate swirl, and an exhaust gap 6 is provided for direct discharge of extinguished particulate matter. Based on this, it is found that the branch exhaust pipe 2 can be further modified so that two branch exhaust pipes 2 can be used together to form an HQ pipe structure to significantly attenuate low-frequency noise, ultimately forming a structure combining a spiral pipe section 3 and a straight pipe section 4. Simultaneously, the spiral pipe section 3 also forms an internal space that can accommodate a cooling device 7. Compared to existing structures, the cooling device 7 in this application can directly cool the straight pipe section 4 and indirectly cool the spiral pipe section 3, greatly improving the cooling effect.

[0030] In one embodiment, the outer shell 1 is a cylindrical structure. The cylindrical structure matches the external shape of the helical tube segment 3.

[0031] In one implementation, the spatial helix is ​​right-handed and has four turns.

[0032] In one embodiment, the cooling device 7 is a cooling water jacket. Each spiral tube segment 3 has an inner cooling water jacket, and two cooling water jackets are connected in series via pipes. Each cooling water jacket has an inlet pipe and an outlet pipe, with the ends of the inlet and outlet pipes extending out of the outer casing 1. The cooling water jacket can directly liquid cool the straight tube segment 4, resulting in high heat exchange efficiency. Secondly, it also has a certain cooling effect on the spiral tube segment 3. Specifically, the cooling water jacket can cool the external air, while the spiral tube segment 3 will release heat in a low-temperature environment, ultimately reducing the temperature of the spiral tube segment 3. Preferably, the shape of the cooling water jacket matches the spatial shape of the inner side of the spiral tube segment 3. Preferably, parallel heat dissipation fins 8 are arranged axially on the inner wall of the cooling water jacket. The heat dissipation fins can effectively increase the heat exchange area, enhance the surface heat exchange of the cooling water jacket, and improve the heat exchange effect on the spiral tube segment 3. Preferably, in the working state, the axis of the spiral tube section 3 is perpendicular to the placement plane, and the end of the outer casing 1 extending from the inlet and outlet water pipes is away from the placement plane. The straight end pipe and straight tube section 4 on the same side as the inlet water pipe are respectively connected to separate exhaust gas turbines. In this configuration, the cooling water can fill both cooling water jackets before being discharged, ensuring maximum cooling area.

[0033] In one embodiment, the inner wall of the spiral pipe section 3 is provided with a composite sound-absorbing material layer. Preferably, the composite sound-absorbing material layer is made of aluminosilicate fiber, foam ceramic, and / or basalt sound-absorbing cotton.

[0034] In one embodiment, the discharge slot 6 is rectangular, and its length is parallel to the axis of the spiral tube segment 3. Two opposing discharge slots 6 are provided on each turn, and the centerline of the two discharge slots 6, the axis of the straight end tube, and the axis of the straight tube segment 4 are coplanar. The length of the discharge slot 6 is equal to the length of the tube body of the spiral tube segment 3 in the direction parallel to the axis of the spiral tube segment 3, and the width of the discharge slot 6 is 0.6 mm to 2.36 mm.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] If this invention discloses or relates to components or structural parts that are fixedly connected to each other, then, unless otherwise stated, a fixed connection can be understood as: a fixed connection that can be detached (e.g., using bolts or screws), or a fixed connection that cannot be detached (e.g., riveting, welding). Of course, a fixed connection can also be replaced by an integral structure (e.g., manufactured in one piece using a casting process) (except where it is obviously impossible to use an integral molding process).

[0037] In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in this invention to indicate positional relationships or shapes include states or shapes that are similar to, close to, or approximate with those states or shapes.

[0038] Any component provided by this invention can be assembled from multiple individual components or can be a single component manufactured by a one-piece molding process.

[0039] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0040] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine, characterized in that: Includes an outer shell (1), inside which are provided two branch exhaust pipes (2) with identical structures. Each branch exhaust pipe (2) includes a spiral pipe section (3). The spiral pipe section (3) is formed by scanning a rectangular spatial spiral line that passes through the geometric center of the rectangle and whose tangent is perpendicular to the rectangle. The long side of the rectangle is parallel to the axis of the spatial spiral line. The pitch of the spatial spiral line is fixed and greater than the length of the long side of the rectangle. The diameter of the spatial spiral line is fixed and greater than the length of the short side of the rectangle. The first end of the spiral pipe section (3) is connected to the first end of an external elbow. The second end of the external elbow is a straight pipe. The axis of the straight pipe is parallel to the axis of the spatial spiral line. The second end of the spiral pipe section (3) is connected to the first end of a straight pipe section (4) through an internal elbow (5). The axis of the straight pipe section (4) is parallel to the axis of the spatial spiral line. The projection of the plane with the extension direction of the axis of the spatial spiral line as the frontal direction is considered. The branch exhaust pipe (2) has a projection profile that coincides with the projection profile of the straight pipe section (4), and the projection profile of the end pipe is located in the inner circle of the projection profile of the spiral pipe section (3). The two branch exhaust pipes (2) are mirrored, the inner elbows (5) of the two branch exhaust pipes (2) are aligned, and one straight pipe section (4) is inserted into the other branch exhaust pipe (2). The part of the straight end pipe extending out of the outer shell (1) is connected to the part of the straight pipe section (4) extending out of the outer shell (1) on the same side. The two inner elbows (5) are connected. The spiral pipe section (3) has a hollowed-out discharge gap (6) on the side facing the inner wall of the outer shell (1). The inner side of the spiral pipe section (3) is also provided with a cooling device (7). The straight pipe section (4) passes through the cooling device (7). There is a gap between the outer wall of the cooling device (7) and the spiral pipe section (3). The difference between the length of the spatial spiral and the length of the straight pipe section (4) is ΔL. , where n is an integer order, n takes the values ​​0, 1, 2, 3, ..., c is the speed of sound in the medium, and f0 is the frequency to be silenced.

2. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 1, characterized in that: The outer shell (1) is a cylindrical structure.

3. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 1, characterized in that: The spatial spiral rotates to the right and has four turns.

4. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 1, characterized in that: The cooling device (7) is a cooling water jacket. A cooling water jacket is provided on the inner side of each spiral tube section (3). Two cooling water jackets are connected in series through pipelines. One cooling water jacket is provided with an inlet pipe and an outlet pipe. The end of the inlet pipe and the end of the outlet pipe extend out of the outer shell (1).

5. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 4, characterized in that: The shape of the cooling water jacket matches the spatial shape of the inner side of the spiral tube section (3).

6. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 4, characterized in that: The inner wall of the cooling water jacket is provided with parallel heat dissipation fins (8) along the axial direction.

7. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 4, characterized in that: In the working state, the axis of the spiral tube section (3) is perpendicular to the placement plane, and one end of the outer shell (1) extending out of the water inlet pipe and the water outlet pipe is away from the placement plane. The straight end pipe and the straight tube section (4) on the same side as the water inlet pipe are respectively connected to separate exhaust gas turbines.

8. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 1, characterized in that: The inner wall of the spiral tube section (3) is provided with a composite sound-absorbing material layer.

9. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 8, characterized in that: The composite sound-absorbing material layer is made of aluminum silicate fiber, foam ceramic and / or basalt sound-absorbing cotton.

10. The exhaust muffler for a marine dual-exhaust turbine multi-cylinder diesel engine according to claim 1, characterized in that: The discharge slot (6) is rectangular, and the length direction of the discharge slot (6) is parallel to the axis of the spiral tube section (3). Two opposite discharge slots (6) are provided on each turn. The center line of the two discharge slots (6), the axis of the straight end tube, and the axis of the straight tube section (4) are coplanar. The length of the discharge gap (6) is equal to the length of the tube body of the spiral tube segment (3) in the direction parallel to the axis of the spiral tube segment (3), and the width of the discharge gap (6) is 0.6 mm to 2.36 mm.

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