A kind of active type water backflow prevention device of marine exhaust pipe

Abstract

The present application belongs to the technical field of ship water backflow prevention, and discloses a kind of active water backflow prevention device for exhaust pipe of ship.The device includes shell, active waterproof mechanism, active drainage mechanism and control unit.Shell is equipped with air inlet and exhaust port at both ends, and is equipped with liquid collection area at bottom.Active waterproof mechanism includes baffle assembly and drive assembly, baffle assembly is arranged in shell, and drive assembly is used to drive baffle assembly to rotate.Active drainage mechanism includes detection assembly and drainage assembly, detection assembly is used to detect liquid level, and drainage assembly is communicated with the bottom of liquid collection area for forced drainage.Control unit is configured to control baffle assembly to rotate to intercept position when detecting liquid, and to start forced drainage at the same time.The device can automatically detect backflow seawater and actively respond, without manual intervention, with fast forced drainage speed, and water is not easy to store in the device.Baffle assembly is in non-interception state when no water enters, with small exhaust resistance.

Description

Technical Field

[0001] This invention relates to the field of marine waterproofing and backflow prevention technology, and in particular to an active waterproofing and backflow prevention device for marine exhaust pipes. Background Technology

[0002] Yachts, sightseeing boats, and inland river cruise ships typically place their engine exhaust pipes at the stern to eliminate the need for a chimney structure, save space on board, avoid restrictions on bridge passage due to chimney height, and prevent soot from falling onto the stern deck.

[0003] However, this arrangement places the exhaust pipe outlet very close to the water surface, making it susceptible to water ingress during rough seas or when the ship is pitching, rolling, or heaving. To prevent backflow, a plate-type check valve is typically installed at the end of the exhaust pipe. In practice, the sealing reliability of plate-type check valves is limited under continuously turbulent sea conditions. The baffles, constantly subjected to wave impacts and exhaust gas flow, are prone to deformation, jamming, or even detachment. If the check valve fails, the exhaust pipe is directly exposed to the risk of backflow, and seawater may enter the engine along the pipeline, causing serious damage.

[0004] Several improvement solutions have been proposed to address the issue of water ingress into the exhaust pipe. One approach involves adding a rotating baffle inside the pipe, which can be manually closed to block water flow when ingress occurs. However, this method has drawbacks. The exhaust pipe experiences high exhaust pressure during engine operation, making manual operation of the baffle difficult. Furthermore, sudden and unpredictable waves and storm surges often make intervention too late once water ingress is detected. Another approach uses a labyrinthine structure, causing the exhaust to deflect multiple times within the device. The winding flow channels dissipate water energy and impede its advance, while drainage is achieved through bottom openings. However, the labyrinth structure increases exhaust resistance, leading to increased engine exhaust back pressure, decreased power performance, increased fuel consumption, and a tendency for black smoke to appear from the exhaust pipe. Additionally, this device relies on gravity for drainage, which is slow, and water can easily accumulate inside when the ship is rocking, making its backflow prevention effect less than ideal.

[0005] Therefore, there is an urgent need for an active waterproof backflow device for marine exhaust pipes to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an active waterproof backflow device for marine exhaust pipes, so as to solve the problems of existing exhaust pipe anti-backflow devices being unable to effectively prevent seawater backflow, having high exhaust resistance, and incomplete drainage when the plate check valve at the end of the exhaust pipe fails.

[0007] To achieve this objective, the present invention adopts the following technical solution: An active waterproof backflow device for marine exhaust pipes includes: The housing has an air inlet and an exhaust outlet at its two ends, and a liquid collection area at its bottom. An active waterproofing mechanism includes a baffle assembly and a drive assembly. The baffle assembly is disposed within the housing, and the drive assembly is pulsatorically connected to the baffle assembly and is used to drive the baffle assembly to rotate. An active drainage mechanism includes a detection component and a drainage component. The detection component is disposed within the liquid collection area and is used to detect the liquid level of the liquid. The drainage component is connected to the bottom of the liquid collection area and is used for forced drainage. The control unit is signal-connected to the drive assembly, the detection assembly, and the drainage assembly. The control unit is configured to control the drive assembly to rotate the baffle assembly to the interception position when the detection assembly detects accumulated liquid, and at the same time control the drainage assembly to start forced drainage.

[0008] Preferably, the baffle assembly includes at least two movable baffles, and the drive assembly includes at least two servo motors, each of the servo motors driving one of the movable baffles. The control unit can control each of the servo motors to rotate synchronously, so that each of the movable baffles rotates to tilt to form staggered flow channels to block the water flow. After the accumulated liquid in the liquid collection area is drained, the control unit controls each of the servo motors to rotate in the opposite direction, so that each of the movable baffles is reset to the position where the flow channel is facing the air inlet.

[0009] Preferably, the housing is further provided with a baffle positioning assembly, which includes a limit switch and is disposed on the rotation path of the movable baffle; when the movable baffle rotates to the interception position or the sequential state, the limit switch is triggered and the servo motor stops rotating.

[0010] Preferably, each of the movable baffles has multiple water-blocking flat irons spaced apart on both sides of its surface to reduce the flow rate of the backflowing seawater. And / or, a plurality of water-blocking flat irons are spaced apart on the inner wall of the housing corresponding to the position of the movable baffle.

[0011] Preferably, the liquid collection area includes a first liquid collection tank and a second liquid collection tank arranged sequentially along the gas flow direction, with the first liquid collection tank located at one end of the air inlet of the housing and the second liquid collection tank located at one end of the exhaust outlet of the housing. The detection components are provided in both the first and second liquid collection tanks. Each detection component includes a liquid level sensor, which is signal-connected to the control unit.

[0012] Preferably, each of the detection components includes two of the liquid level sensors.

[0013] Preferably, the control unit further includes a delay determination module, the input terminal of which is connected to the signal output terminal of the detection component, and the output terminal of which is connected to the control terminal of the drive component.

[0014] Preferably, the control unit is further configured to: when neither the detection component in the first liquid accumulation tank nor the detection component in the second liquid accumulation tank detects liquid accumulation for a preset time, control the drive component to drive the baffle component to reset.

[0015] Preferably, the drainage assembly includes a solenoid valve, a pneumatic valve, and a pneumatic jet pump. The output end of the solenoid valve is connected to the air inlet end of the pneumatic valve, the input end of the solenoid valve is connected to a compressed air source, the air outlet end of the pneumatic valve is connected to the air inlet end of the pneumatic jet pump, the liquid inlet end of the pneumatic jet pump is connected to the liquid collection area at the bottom of the hull, and the outlet of the pneumatic jet pump extends overboard.

[0016] Preferably, the air intake and the exhaust port are respectively provided with flanges, the flange of the air intake is connected to the engine exhaust pipe, the flange of the exhaust port is connected to a plate check valve, and / or the central axes of the air intake and the exhaust port coincide.

[0017] The beneficial effects of this invention are: This invention provides an active waterproof backflow device for marine exhaust pipes, comprising a housing, an active waterproofing mechanism, an active drainage mechanism, and a control unit. The housing has an air inlet and an exhaust outlet at both ends, and a liquid collection area at the bottom. The active waterproofing mechanism includes a baffle assembly and a drive assembly. The baffle assembly is disposed within the housing, and the drive assembly is kinetically connected to the baffle assembly and drives its rotation. The active drainage mechanism includes a detection assembly and a drainage assembly. The detection assembly is disposed within the liquid collection area and detects the liquid level. The drainage assembly is connected to the bottom of the liquid collection area and forces drainage. The control unit is signal-connected to the drive assembly, the detection assembly, and the drainage assembly. The control unit is configured to, when the detection assembly detects liquid, control the drive assembly to rotate the baffle assembly to an interception position, and simultaneously control the drainage assembly to initiate forced drainage. When the detection assembly detects seawater entering the liquid collection area, the control unit automatically controls the drive assembly to rotate the baffle assembly to an interception position, eliminating the need for manual judgment and operation. This timely response solves the problem of unpredictable and uninterrupted action during storms. Simultaneously, the drainage component initiates forced drainage, actively expelling seawater that has entered the device. The drainage speed is fast, and water does not easily accumulate inside the device. When no water enters, the baffle component is in a non-blocking state, which does not affect the smooth flow of exhaust, resulting in low exhaust resistance and ensuring the engine's power performance and economy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the active waterproof backflow device for marine exhaust pipes in an embodiment of the present invention; Figure 2 In the embodiment of the present invention, the shell is in a state where no water has entered along the... Figure 1 A schematic diagram of the cross-sectional structure of AA; Figure 3 This is the present invention. Figure 2 A schematic cross-sectional view of the middle BB; Figure 4 In the embodiment of the present invention, under the state of water ingress inside the shell, along Figure 1 A schematic diagram of the cross-sectional structure of AA; Figure 5 This is the present invention. Figure 4 A cross-sectional view of the middle section BB.

[0019] In the picture: 1. Housing; 2. Servo motor; 3. Movable baffle; 4. Limit switch; 5. Liquid level sensor; 6. Solenoid valve; 7. Pneumatic valve; 8. Water-blocking flat iron; 9. Air-jet pump; 10. Control unit. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] like Figures 1 to 5As shown, this invention discloses an active waterproof backflow device for marine exhaust pipes, comprising a housing 1, an active waterproofing mechanism, an active drainage mechanism, and a control unit 10. The housing 1 has an air inlet and an exhaust outlet at both ends, and a liquid collection area at the bottom. The active waterproofing mechanism includes a baffle assembly and a drive assembly. The baffle assembly is disposed within the housing 1, and the drive assembly is kinetically connected to the baffle assembly and drives the baffle assembly to rotate. The active drainage mechanism includes a detection assembly and a drainage assembly. The detection assembly is disposed within the liquid collection area and is used to detect the liquid level. The drainage assembly is connected to the bottom of the liquid collection area and is used for forced drainage. The control unit 10 is signal-connected to the drive assembly, the detection assembly, and the drainage assembly. The control unit 10 is configured to, when the detection assembly detects liquid, control the drive assembly to rotate the baffle assembly to an interception position, and simultaneously control the drainage assembly to initiate forced drainage.

[0025] It is understood that the marine exhaust pipe active waterproof backflow device disclosed in this invention is installed in series between the engine exhaust pipe and the plate check valve at the end of the exhaust pipe. The air inlet of the housing 1 is connected to the engine exhaust pipe, and the exhaust outlet is connected to the plate check valve. Figure 2 and Figure 3 As shown, under normal navigation and calm sea conditions, the baffle assembly is in the compliant position, and the exhaust airflow flows directly from the intake port through the inside of housing 1 to the exhaust port, with minimal exhaust resistance, which does not affect the normal operation of the engine. In rough sea conditions such as stormy weather, seawater overflows the malfunctioning plate check valve and enters housing 1, causing seawater to accumulate in the liquid collection area. Once the detection component detects the liquid accumulation signal, the control unit 10 immediately controls the drive component to rotate the baffle assembly to the interception position, preventing seawater from continuing to flow towards the engine. The movable baffle 3 is in the interception position as shown in the diagram. Figure 4 and Figure 5 As shown. Simultaneously, the control unit 10 activates the drainage assembly, using power to forcefully drain the seawater from the collection area overboard. The entire backflow prevention process, from detection to response, is fully automated, requiring no manual judgment or operation. Once the seawater has been drained, the control unit 10 controls the drive assembly to reset the baffle assembly to its proper position, the drainage assembly stops working, and the venting passage is restored to unobstructed flow.

[0026] In some embodiments, the baffle assembly includes at least two movable baffles 3, and the drive assembly includes at least two servo motors 2, each servo motor 2 driving one movable baffle 3; the control unit 10 can control the servo motors 2 to rotate synchronously, causing the movable baffles 3 to rotate to an inclined position to form staggered flow channels to block the direct flow of water, and after the accumulated liquid in the liquid collection area is drained, control the servo motors 2 to rotate in the opposite direction, causing the movable baffles 3 to reset to the position where the flow channels face the air inlet. It is understood that, as Figure 4 and Figure 5As shown, this embodiment employs two movable baffles 3, which are arranged at an angle in the interception state. This creates staggered flow channels between the baffles, requiring seawater entering from the exhaust port to undergo multiple directional changes within these channels before continuing its flow, effectively consuming water energy and preventing direct impact on the air intake. Simultaneously, this angled arrangement does not completely block the exhaust passage, allowing the engine to maintain a certain level of exhaust flow and preventing a sharp increase in exhaust back pressure. When the signal from the level sensor 5 disappears and is confirmed after a delay, the servo motor 2 rotates in the opposite direction, returning the movable baffles 3 to their aligned position with the airflow direction, minimizing exhaust resistance. The servo motor 2 is precisely controlled by the control unit 10, exhibiting good synchronization and enabling rapid response to water inlet signals. In some alternative embodiments, the movable baffle 3 can also be a single unit, driven by a single servo motor 2, rotating to the interception position during water inlet and resetting after drainage.

[0027] In some embodiments, the housing 1 is further provided with a baffle positioning assembly, which includes a limit switch 4 disposed on the rotation path of the movable baffle 3. When the movable baffle 3 rotates to the intercept position or the sequential position, the limit switch 4 is triggered, and the servo motor 2 stops rotating. It is understood that the limit switch 4 provides a reliable mechanical positioning reference point for the baffle rotation. The servo motor 2 drives the movable baffle 3 to rotate. When the baffle reaches a preset angle, it touches the limit switch 4, and the switch trigger signal is fed back to the control unit 10. The control unit 10 then cuts off the drive signal of the servo motor 2, causing the baffle to accurately stop at the intercept position or the sequential position. This method has a simple structure, reliable positioning, and does not require a complex angle encoder or stepper control. In some alternative embodiments, baffle positioning can also be achieved through the encoder built into the servo motor 2 to achieve angle position control, or other position detection elements such as proximity switches or photoelectric switches can be used to replace the mechanical limit switch 4.

[0028] In some embodiments, such as Figure 2As shown, multiple water-blocking flat irons 8 are spaced apart on both sides of each movable baffle 3 to reduce the flow velocity of backflowing seawater; and / or, multiple water-blocking flat irons 8 are spaced apart on the inner wall of the housing 1 corresponding to the position of the movable baffle 3. It can be understood that the water-blocking flat irons 8 are vertically extending strip structures, protruding laterally from the surface of the movable baffle 3 or the inner wall of the housing 1, and the protrusion direction of the water-blocking flat irons 8 is set at an inclined angle to the exhaust direction, forming a Tesla valve structure. When the movable baffle 3 is in the interception position, the backflowing seawater is first blocked by the staggered flow channels formed by the movable baffle 3, forcing the flow direction to change multiple times, and the mainstream flow velocity has already been reduced. Afterwards, when the water flow continues to advance towards the engine, it enters the area where the water-blocking flat irons 8 are located. The water flow is guided and diverted step by step along the inclined protruding flat iron surface, forming local eddies and energy dissipation, further reducing the flow velocity, thereby minimizing the impact of the water flow on the internal structure of the device. The movable baffle 3 and the water-blocking flat iron 8 work together to gradually slow down and block the backflow of water. When the baffle is in the correct position, the tilt direction of the water-blocking flat iron 8 is basically consistent with the direction of the exhaust airflow, and has little impact on the exhaust resistance. In some optional embodiments, the cross-sectional shape of the water-blocking flat iron 8 can be rectangular, trapezoidal, or semi-circular, and its protrusion height and adjacent spacing can be designed and adjusted according to the inner diameter of the shell 1 and the expected water flow velocity.

[0029] In some embodiments, the liquid collection area includes a first liquid collection tank and a second liquid collection tank arranged sequentially along the gas flow direction of the exhaust. The first liquid collection tank is located at one end of the air inlet of the housing 1, and the second liquid collection tank is located at one end of the exhaust outlet of the housing 1. Both the first and second liquid collection tanks are equipped with detection components, each including a liquid level sensor 5, which is signal-connected to the control unit 10. It is understood that by setting liquid collection tanks at both the front and rear ends of the bottom of the housing 1, seawater flowing in from the exhaust outlet and water that may flow in from the air inlet can be collected respectively, with the detection range covering the entire bottom area of ​​the device. The two detection components operate independently. When either detection component detects water, the control unit 10 will trigger an anti-backflow action, ensuring that seawater can be detected promptly regardless of its direction of entry, thus improving the safety redundancy of the device.

[0030] In some embodiments, each detection component includes two level sensors 5. It is understood that two level sensors 5 are provided at each detection location, one operating as the primary sensor and the other as a backup sensor. When one sensor fails, the other can still ensure normal detection function, further improving the reliability of the system.

[0031] In some embodiments, the control unit 10 further includes a delay determination module. The input of the delay determination module is connected to the signal output of the detection component, and the output of the delay determination module is connected to the control terminal of the drive component. In some embodiments, the control unit 10 is further configured to: control the drive component to reset the baffle assembly when neither the detection component in the first accumulating tank nor the detection component in the second accumulating tank detects any accumulating liquid for a preset time. It is understood that during actual sea navigation, the ship's hull continuously rocks, and the liquid level in the accumulating tank fluctuates accordingly, and the level sensor 5 may experience instantaneous signal jumps. If the baffle is reset immediately after the accumulating liquid disappears, it may cause the baffle to operate frequently, affecting the lifespan of the device and increasing the burden on the control system. By setting a delay determination module, only when the level sensors 5 in both accumulating tanks report no water accumulation and this state is maintained for a preset time is it determined that the water has been completely drained, thus allowing the baffle to reset. The preset time can typically be set to a few seconds to tens of seconds, specifically determined based on the ship's rolling cycle and drainage speed, thus effectively avoiding malfunctions caused by rolling or surges.

[0032] In some embodiments, the drainage assembly includes a solenoid valve 6, a pneumatic valve 7, and a pneumatic jet pump 9. The output end of the solenoid valve 6 is connected to the air inlet end of the pneumatic valve 7, the input end of the solenoid valve 6 is connected to a compressed air source, the outlet end of the pneumatic valve 7 is connected to the air inlet end of the pneumatic jet pump 9, the liquid inlet end of the pneumatic jet pump 9 is connected to the liquid collection area at the bottom of the housing 1, and the outlet of the pneumatic jet pump 9 extends overboard. It is understood that when the control unit 10 issues a drainage command, the solenoid valve 6 is energized and opens. High-pressure gas from the compressed air source enters the air inlet end of the pneumatic valve 7 through the solenoid valve 6, driving the pneumatic valve 7 to open. The high-pressure gas enters the nozzle of the pneumatic jet pump 9, forming a high-speed jet within the pump body that generates negative pressure. This draws in seawater from the liquid collection area, mixes it, and discharges it overboard. The forced drainage using the pneumatic jet pump 9 is fast, unaffected by the ship's draft or the back pressure at the outlet, and can reliably drain water even when the external water level is high. The pneumatic valve 7 makes the on / off control of high-pressure gas more reliable, and the solenoid valve 6, as a pilot control valve, has low power consumption and fast response. The compressed air source can be taken from the ship's own gas cylinders or air compressor system. In some alternative embodiments, the drainage assembly can also use an electric water pump instead of the pneumatic jet pump 9, with the control unit 10 directly controlling the pump's start and stop to achieve forced drainage, or a hydraulically driven jet pump can be used to adapt to the energy configuration of different ships.

[0033] In some embodiments, the air inlet and exhaust outlet are respectively provided with flanges (not shown in the figure). The flange of the air inlet is connected to the engine exhaust pipe (not shown in the figure), and the flange of the exhaust outlet is connected to a plate check valve (not shown in the figure), and / or, the central axes of the air inlet and exhaust outlet coincide. It is understood that both the air inlet and exhaust outlet are connected by flanges, which facilitates the series installation and disassembly maintenance of the device in the exhaust pipeline. The air inlet flange is connected to the engine exhaust pipe, and the exhaust outlet flange is connected to the plate check valve. The marine exhaust pipe active waterproof backflow device disclosed in this invention is located in the pipeline between the check valve and the engine, serving as a second waterproof barrier. When the central axes of the air inlet and exhaust outlet coincide, the airflow flows directly within the housing 1, with the shortest path and the least exhaust resistance, which is beneficial to ensuring the engine power performance. In some alternative embodiments, depending on the installation space requirements, the central axes of the air inlet and exhaust outlet may also have a certain angle or eccentric setting to adapt to the pipeline layout requirements of different ship types.

[0034] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An active waterproof backflow device for marine exhaust pipes, characterized in that, include: The housing (1) has an air inlet and an exhaust outlet at its two ends, and a liquid collection area at the bottom of the housing (1). An active waterproofing mechanism includes a baffle assembly and a drive assembly. The baffle assembly is disposed inside the housing (1). The drive assembly is connected to the baffle assembly and is used to drive the baffle assembly to rotate. An active drainage mechanism includes a detection component and a drainage component. The detection component is disposed within the liquid collection area and is used to detect the liquid level of the liquid. The drainage component is connected to the bottom of the liquid collection area and is used for forced drainage. The control unit (10) is signal connected to the drive assembly, the detection assembly and the drainage assembly, and the control unit (10) is configured to control the drive assembly to rotate the baffle assembly to the interception position when the detection assembly detects the accumulated liquid, and at the same time control the drainage assembly to start forced drainage.

2. The active waterproof backflow device for marine exhaust pipes according to claim 1, characterized in that, The baffle assembly includes at least two movable baffles (3), and the drive assembly includes at least two servo motors (2), each of the servo motors (2) driving one of the movable baffles (3); The control unit (10) can control each of the servo motors (2) to rotate synchronously, so that each of the movable baffles (3) rotates to tilt to form an interlaced flow channel to block the water flow. After the accumulated liquid in the liquid collection area is drained, the control unit (10) controls each of the servo motors (2) to rotate in the opposite direction, so that each of the movable baffles (3) is reset to the position where the flow channel is facing the air inlet.

3. The active waterproof backflow device for marine exhaust pipes according to claim 2, characterized in that, The housing (1) is also provided with a baffle positioning assembly, which includes a limit switch (4). The limit switch (4) is set on the rotation path of the movable baffle (3). When the movable baffle (3) rotates to the interception position or the sequential state, the limit switch (4) is triggered, and the servo motor (2) stops rotating.

4. The active waterproof backflow device for marine exhaust pipes according to claim 2, characterized in that, Each of the movable baffles (3) has multiple water-blocking flat irons (8) spaced apart on both sides to reduce the flow rate of backflow into the seawater; And / or, a plurality of water-blocking flat irons (8) are provided at intervals on the inner wall of the housing (1) corresponding to the position of the movable baffle (3).

5. The active waterproof backflow device for marine exhaust pipes according to claim 1, characterized in that, The liquid collection area includes a first liquid collection tank and a second liquid collection tank arranged sequentially along the gas flow direction. The first liquid collection tank is located at one end of the air inlet of the housing (1), and the second liquid collection tank is located at one end of the exhaust port of the housing (1). The detection components are provided in both the first and second liquid accumulation tanks. Each detection component includes a liquid level sensor (5), which is signal-connected to the control unit (10).

6. The active waterproof backflow device for marine exhaust pipes according to claim 5, characterized in that, Each of the aforementioned detection components includes two of the aforementioned liquid level sensors (5).

7. The active waterproof backflow device for marine exhaust pipes according to claim 5, characterized in that, The control unit (10) further includes a delay determination module. The input terminal of the delay determination module is connected to the signal output terminal of the detection component, and the output terminal of the delay determination module is connected to the control terminal of the drive component.

8. The active waterproof backflow device for marine exhaust pipes according to claim 7, characterized in that, The control unit (10) is further configured to: when neither the detection component in the first liquid accumulation tank nor the detection component in the second liquid accumulation tank detects liquid accumulation for a preset time, control the driving component to drive the baffle component to reset.

9. The active waterproof backflow device for marine exhaust pipes according to claim 1, characterized in that, The drainage assembly includes a solenoid valve (6), a pneumatic valve (7), and a pneumatic jet pump (9). The output end of the solenoid valve (6) is connected to the air inlet end of the pneumatic valve (7). The input end of the solenoid valve (6) is connected to a compressed air source. The outlet end of the pneumatic valve (7) is connected to the air inlet end of the pneumatic jet pump (9). The liquid inlet end of the pneumatic jet pump (9) is connected to the liquid collection area at the bottom of the housing (1). The outlet of the pneumatic jet pump (9) extends to the outside of the hull.

10. The active waterproof backflow device for marine exhaust pipes according to any one of claims 1-9, characterized in that, The air intake and the exhaust port are respectively provided with flanges. The flange of the air intake is connected to the engine exhaust pipe, and the flange of the exhaust port is connected to a plate check valve. And / or, the central axes of the air intake and the exhaust port coincide.

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