A vehicle exhaust system plugging device, vehicle and working method

Abstract

The application provides a vehicle exhaust system plugging device, a vehicle and a working method, relates to the field of vehicles, aims at the problems of exhaust back pressure rising caused by the existing sealing assembly occupying the exhaust passage for a long time and the rubber part being prone to failure in a high-temperature environment, and achieves the following effects: a receiving container is arranged outside the exhaust pipe wall, and a retractable elastic bag is matched, so that in the land mode, the plugging body can completely retreat into the receiving cavity outside the internal passage of the exhaust pipe, the integrity of the internal flow field of the exhaust pipe is ensured, the engine efficiency loss and the carbon deposition risk caused by the increased flow resistance are effectively relieved, the fluid channel and the multiple liquid outlets arranged in the fixing part change the passive sealing medium into a dynamic cooling medium, the liquid with high specific heat capacity is used to spray and heat exchange the inner wall of the elastic bag in the injection and circulation process, the thermal load of the elastic bag when contacting the high-temperature exhaust gas is reduced, and the thermal aging process of the elastic material is delayed to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of vehicles, and more specifically to a vehicle exhaust system sealing device, a vehicle, and a working method. Background Technology

[0002] Currently, in the field of exhaust gas sealing for amphibious vehicles or vehicles used in water-crossing operations, the mainstream solutions mainly include mechanical sealing valves and built-in inflatable airbag devices. Mechanical sealing valves typically have a metal flap or slide valve inside the exhaust pipe, which is opened and closed via a linkage mechanism. Inflatable sealing devices, on the other hand, often use a support guide rod at the center of the exhaust pipe, with a foldable elastic airbag wrapped around the guide rod. Compressed gas is injected into the airbag to inflate it and cut off the exhaust passage. When the vehicle is wading at low speed or stationary, these devices can provide some water resistance, preventing external water from flowing back into the engine.

[0003] However, in practical applications, existing sealing components such as valve shafts, central guide rods, or retracted airbag skins are always located inside the exhaust pipe flow channel. This permanent occupation leads to a significant increase in exhaust back pressure, hindering engine exhaust efficiency and causing severe flow resistance and carbon buildup risks at high speeds, making it difficult to meet the power performance requirements of vehicles in land mode. The high temperature environment inside the exhaust pipe makes rubber seals prone to thermal failure. Existing airbag-type sealing methods, due to the low specific heat capacity of the internal gas, are easily damaged and deformed by the temperature inside the exhaust pipe. This makes it easy for the airbag to get stuck or not fully retract during retraction and reset, further increasing flow resistance and carbon buildup problems, affecting the working effect of the exhaust sealing system, and making it difficult to meet the exhaust system sealing requirements of amphibious vehicles and wading vehicles. Summary of the Invention

[0004] In view of this, the present invention provides a vehicle exhaust system sealing device, a vehicle, and a working method, which ensures the integrity of the internal flow field during exhaust pipe operation and mitigates the risk of engine efficiency loss and carbon buildup caused by increased flow resistance.

[0005] The first objective of this invention is to provide a vehicle exhaust system sealing device, which employs the following solution:

[0006] include: The window is located on the wall of the exhaust pipe; The storage container is sealed to the outer periphery of the window, and a storage cavity is formed inside the storage container. The fixing part is set inside the storage cavity, and has a fluid channel inside. The fixing part also has multiple liquid outlets that communicate with the fluid channel. The elastic bladder is sealed and fixed to the fixed part at its root, and the bladder cavity inside the elastic bladder is connected to the liquid outlet. The elastic bladder has a retracted state and a blocked state. In the retracted state, the elastic bladder is retracted into the retracted cavity. In the blocked state, external fluid is injected into the elastic bladder through the liquid outlet of the fixed part, driving the elastic bladder to pass through the window and expand, thereby cutting off the internal passage of the exhaust pipe.

[0007] Furthermore, the elastic bladder is provided with an elastic reset member. One end of the elastic reset member is connected to the inner wall of the top of the elastic bladder away from the root of the elastic bladder, and the other end is connected to the fixing part. It is used to provide a reset force to pull the elastic bladder toward the fixing part when the fluid in the elastic bladder is discharged.

[0008] Furthermore, the storage container is provided with a reflux circulation port, which is connected to the bladder cavity through the circulation channel in the fixed part. The reflux circulation port is connected to an external fluid source. After the fluid enters the bladder cavity through the liquid outlet, it can be discharged from the bladder cavity through the reflux circulation port. When the elastic bladder is in the storage state or the blocked state, the external fluid flows through the bladder cavity to form convective cooling of the inner wall of the elastic bladder.

[0009] Furthermore, the reflux circulation port and the liquid outlet are respectively connected to an external fluid source through pipes. By adjusting the flow difference between the reflux circulation port and the liquid outlet, the expansion and contraction of the elastic bladder can be controlled.

[0010] Furthermore, the surface of the elastic bladder has a preset folding texture, which guides the elastic bladder to collapse and fold along a preset path in the stored state so as to pass through the window and enter the storage cavity.

[0011] Furthermore, the circumferential edge of the window is provided with a rounded corner transition structure; The fixing part has multiple liquid outlets arranged radially or spirally, so that the injected fluid is sprayed into the inner cavity of the elastic bladder.

[0012] Furthermore, the storage box body is provided in multiple parts, which are distributed at intervals along the internal channel of the exhaust pipe.

[0013] A second object of the present invention is to provide a vehicle that utilizes a vehicle exhaust system sealing device as described in the first object.

[0014] A third objective of the present invention is to provide a method for operating a vehicle exhaust system sealing device, for assembling a vehicle exhaust system sealing device as described in the first objective, comprising: During the sealing process, external fluid is controlled to enter the fluid channel of the fixed part and injected into the bladder cavity of the elastic bladder through multiple outlets, driving the elastic bladder to expand and enter the exhaust pipe through the window to cut off the internal channel of the exhaust pipe. During the retraction process, the fluid inside the elastic bladder is discharged, causing the elastic bladder to retract and pass through the window into the retraction cavity, thereby releasing the blockage of the internal passage of the exhaust pipe.

[0015] Furthermore, the fluid is continuously introduced into the bladder cavity through the outlet and discharged through the return circulation port on the receiving container to form a fluid circulation, which removes the heat from the elastic bladder. During the sealing process, the flow rate of the fluid injected into the outlet is increased to be greater than the flow rate of the fluid discharged from the return circulation port, so as to establish the intracavitary pressure to drive the elastic bladder to expand. During the storage process, the fluid flow rate at the injection outlet is reduced to be less than the fluid flow rate at the return circulation outlet, thereby reducing the intracavitary pressure and driving the elastic bladder to contract.

[0016] Compared with the prior art, the advantages and positive effects of this invention are: To address the issues of increased exhaust back pressure and easy failure of rubber components in high-temperature environments caused by the long-term occupation of the exhaust passage by existing sealing components, a storage container is installed on the outside of the exhaust pipe wall, in conjunction with a retractable elastic bladder. This allows the sealing body to completely retract into the storage cavity outside the internal passage of the exhaust pipe in land mode, thus ensuring the integrity of the internal flow field of the exhaust pipe and effectively mitigating the risk of engine efficiency loss and carbon buildup caused by increased flow resistance. The fluid channel and multiple liquid outlets inside the fixing part transform the passive sealing medium into a dynamic cooling medium. The high specific heat capacity of the liquid sprays heat onto the inner wall of the elastic bladder during injection and circulation, reducing the thermal load of the elastic bladder when in contact with high-temperature exhaust gas and delaying the thermal aging process of the elastic material to a certain extent. The coupled design of external storage and active liquid cooling not only ensures the power performance of the vehicle when driving at high speed on land, but also improves the structural stability and reset reliability of the elastic bladder under sealing conditions through stable control of fluid pressure and thermal protection, meeting the exhaust safety requirements of amphibious vehicles or vehicles engaged in wading operations under complex conditions.

[0017] To address the issues of aging and failure of the elastic bladder under exhaust pipe heat load and inaccurate state switching control, a dynamic fluid loop is constructed using a reflux circulation port and multiple liquid outlets within the fixed section. This allows a fluid with a high specific heat capacity to continuously remove the heat absorbed by the exhaust gas from the elastic bladder. By adjusting the flow rate difference between the inlet and reflux, not only can the internal pressure of the bladder be flexibly controlled to achieve a smooth transition between expansion and contraction, but the elastic bladder also remains in a controlled low-temperature environment whether it is in a sealed or retracted state, extending its service life and ensuring long-term reliable operation of the device.

[0018] The internal elastic reset component provides the airbag with axial traction from the apex to the root, while the pre-set fold texture on the surface provides geometric collapse guidance, enabling the airbag to retract neatly along a predetermined path during the drainage process. The coupling mechanism of dynamic reset combined with structural guidance reduces the risk of the airbag being clamped by the edge of the tube wall due to the stacking of folds when passing through the window, which helps to improve the response speed and success rate of the system switching from the closure mode to the land mode.

[0019] By setting radial or spiral liquid outlets in the fixing part, the cooling medium can be evenly covered in the inner cavity of the elastic bladder, avoiding the formation of dead water zones. At the same time, the rounded transition structure around the exhaust pipe window provides a smooth support surface for the elastic bladder in the expanded state, reducing the shear stress of the elastic bladder at the window pressure point, and effectively reducing the risk of bladder wall tearing caused by local thermal overload or stress overload.

[0020] By arranging multiple storage units at intervals along the exhaust pipe axis, a multi-level sealing logic is formed, which improves the system's ability to withstand extreme wading pressure and meets the needs of amphibious vehicles or wading vehicles to operate safely in complex underwater environments. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0022] Figure 1 This is an external schematic diagram of a vehicle exhaust system sealing device in one or more embodiments of the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the stretching of the elastic spring member caused by the inflated state of the elastic bladder in one or more embodiments of the present invention.

[0024] Figure 3 This is a schematic diagram illustrating the retraction of the elastic bladder by the rebound member in one or more embodiments of the present invention.

[0025] Figure 4 This is a schematic diagram of the end of a vehicle exhaust system sealing device in one or more embodiments of the present invention.

[0026] Among them, 1. Window; 2. Storage container; 3. Fixing part; 4. Storage cavity; 5. Exhaust pipe; 6. Fluid channel; 7. Liquid outlet; 8. Elastic bladder; 9. Elastic reset part; 10. Return circulation port; 11. Bladder cavity; 12. Top of elastic bladder; 13. Root of elastic bladder. Detailed Implementation

[0027] Example 1 In a typical embodiment of the present invention, such as Figures 1-4As shown, a vehicle exhaust system sealing device is presented.

[0028] In existing exhaust system sealing devices for amphibious vehicles or wading vehicles, mechanical sealing valves or built-in airbag devices are used. These sealing components occupy space within the exhaust pipe 5 flow channel for extended periods, leading to increased exhaust back pressure, affecting engine efficiency, and creating potential flow resistance and carbon buildup. Furthermore, the high-temperature environment inside the exhaust pipe 5 makes rubber seals prone to thermal failure. Airbag-type seals, due to the low specific heat capacity of the internal gas, are easily deformed by high temperatures, resulting in incomplete or stuck repositioning, further exacerbating flow resistance and carbon buildup problems. Therefore, this embodiment provides a vehicle exhaust system sealing device that ensures the integrity of the internal flow field of the exhaust pipe 5 during operation, mitigating engine efficiency loss and carbon buildup risks caused by increased flow resistance.

[0029] like Figure 1 , Figure 2 As shown, the vehicle exhaust system sealing device includes: A window 1 is formed on the wall of the exhaust pipe 5; a receiving container 2 is sealed to the outer periphery of the window 1, and a receiving cavity 4 is formed inside the receiving container 2; a fixing part 3 is disposed in the receiving cavity 4, and a fluid channel 6 is provided inside the fixing part 3, and multiple liquid outlets 7 communicating with the fluid channel 6 are opened on the fixing part 3; an elastic bladder 8 is sealed and fixed to the fixing part 3 at its root, and the bladder cavity 11 inside the elastic bladder 8 is connected to the liquid outlets 7; the elastic bladder 8 has a receiving state and a blocking state. In the receiving state, the elastic bladder 8 is retracted into the receiving cavity 4; in the blocking state, external fluid is injected into the elastic bladder 8 through the liquid outlets 7 of the fixing part 3, driving the elastic bladder 8 to pass through the window 1 and expand, so as to cut off the internal channel of the exhaust pipe 5.

[0030] like Figure 2 As shown, window 1 is formed on the wall of exhaust pipe 5. The geometry of window 1 can be circular, elliptical, or rectangular, and its size can allow the elastic bladder 8 to pass through smoothly during expansion and contraction. For example, window 1 can be formed by cutting the wall of exhaust pipe 5, or by modifying a segment of exhaust pipe 5 to add a sealing pipe and making a hole in the sealing pipe.

[0031] The interior of the storage container 2 forms a storage cavity 4. The storage container 2 can be fixed to the outside of the exhaust pipe 5 by welding or bolting to ensure a sealed connection between it and the window 1, preventing external environmental substances from entering. Figure 4As shown, the volume of the storage cavity 4 can completely accommodate the elastic bladder 8 in its stored state. The fixing part 3 can be fixed inside the storage container 2 by a bracket or directly. The fluid channel 6 can be a pipe or a flow channel formed in the fixing part 3 by drilling or other processing methods, used to introduce external fluid into the fixing part 3. The liquid outlet 7 can be several small holes distributed on the surface of the fixing part 3, used to spray fluid into the elastic bladder 8.

[0032] like Figure 2 As shown, the cavity 11 inside the elastic bladder 8 communicates with the fluid outlet 7. The elastic bladder 8 can be made of rubber, silicone, or other materials with elasticity and heat resistance. The root of the elastic bladder 8 can be connected to the fixing part 3 by means of clamps, adhesives, or vulcanization to ensure that the fluid does not leak. The cavity 11 of the elastic bladder 8 can withstand the internal fluid pressure and expand.

[0033] like Figure 2 As shown, in the blocked state, external fluid is injected into the elastic bladder 8 through the outlet 7 of the fixing part 3, driving the elastic bladder 8 to pass through the window 1 and expand, thereby cutting off the internal passage of the exhaust pipe 5. For example, when blocking is required, liquid (such as water or coolant) is injected into the fluid passage 6 of the fixing part 3 by an external pump. The liquid enters the bladder cavity 11 of the elastic bladder 8 through the outlet 7, causing the internal pressure of the elastic bladder 8 to increase and expand. The expanded elastic bladder 8 extends out from the receiving cavity 4, passes through the window 1 and enters the interior of the exhaust pipe 5. Its expanded shape is sufficient to completely block the internal passage of the exhaust pipe 5, thereby achieving the cutoff of the exhaust flow.

[0034] like Figure 3 As shown, by completely retracting the elastic bladder 8 into the receiving cavity 4 outside the exhaust pipe 5 under non-sealing conditions, the permanent occupation of the exhaust flow channel by the sealing component in the traditional solution is eliminated, reducing exhaust back pressure and flow resistance. This ensures the engine efficiency and power performance of the vehicle in land mode and reduces the risk of carbon buildup. At the same time, the use of external fluid injection to drive the expansion of the elastic bladder 8 provides a basis for introducing cooling medium, which helps to improve the reliability and service life of the elastic bladder 8 in high-temperature environments and solves the problem that traditional airbags are prone to failure due to high temperatures.

[0035] like Figure 3As shown, during the retraction of the elastic bladder 8, especially when it retreats through the window 1 into the storage cavity 4, due to the flexibility of the elastic bladder 8 material and the complex environment of the internal channel of the exhaust pipe 5, the elastic bladder 8 may experience irregular folding or jamming, thus affecting its smooth and rapid completion of the storage action and reducing the reliability and response speed of the system switching from the blocking mode to the land mode. To address this, in this embodiment, the elastic bladder 8 is provided with an elastic reset member 9. One end of the elastic reset member 9 is connected to the inner wall of the top 12 of the elastic bladder away from the root 13 of the elastic bladder, and the other end is connected to the fixing part 3, used to provide a reset force to pull the elastic bladder 8 towards the fixing part 3 when fluid is discharged from the elastic bladder 8.

[0036] Specifically, the elastic reset member 9 can store and release mechanical energy, providing a continuous pulling force directed towards the fixed part 3 when the fluid inside the elastic bladder 8 is discharged. The elastic reset member 9 can be implemented in various forms, such as a coil spring, tension spring, torsion spring, or an elastic rope or strip structure made of a material with a high elastic modulus (such as rubber, silicone, etc.). Alternatively, it can be a component made of shape memory alloy, which restores a preset shape under specific temperature or stress, thereby generating a reset force.

[0037] like Figure 2 , Figure 3 As shown, one end of the elastic reset member 9 is connected to the inner wall of the top 12 of the elastic bladder, away from the root 13 of the elastic bladder, and the other end is connected to the fixing part 3, ensuring that the reset force can directly act on the distal end of the elastic bladder 8, the part that first enters the internal channel of the exhaust pipe 5 when the elastic bladder 8 expands. By axially pulling from the top of the elastic bladder 8, the elastic bladder 8 can be effectively guided to collapse along a preset path during contraction, avoiding stacking or jamming at the window 1. When the fluid in the elastic bladder 8 is discharged, the pressure in the bladder cavity 11 decreases, and the elastic potential energy stored in the elastic reset member 9 is released, generating a force that pulls the elastic bladder 8 toward the fixing part 3. The pulling force and the elastic restoring force of the elastic bladder 8 work together to make the elastic bladder 8 quickly and smoothly retract from the internal channel of the exhaust pipe 5 and retreat through the window 1 into the receiving cavity 4.

[0038] The axial traction force applied by the elastic reset member 9 from the inner wall of the top 12 of the elastic bladder to the fixing part 3 can actively guide the elastic bladder 8 to retract neatly along a predetermined path, avoiding the risk that the elastic bladder 8 will be clamped by the edge of the exhaust pipe 5 wall due to the stacking of folds when passing through the window 1. This improves the response speed and success rate of the system switching from the blocking mode to the land mode, and ensures the reliable operation of the exhaust system of the vehicle under different working conditions.

[0039] In addition, the storage container 2 is provided with a reflux circulation port 10. The reflux circulation port 10 is connected to the bladder cavity 11 through the circulation channel in the fixing part 3. The reflux circulation port 10 is connected to an external fluid source. After the fluid enters the bladder cavity 11 through the liquid outlet 7, it can be discharged from the bladder cavity 11 through the reflux circulation port 10. When the elastic bladder 8 is in the storage state or the blocked state, the external fluid flows through the bladder cavity 11 to form convective cooling of the inner wall of the elastic bladder 8.

[0040] Specifically, such as Figure 2 and Figure 3 As shown, the reflux port 10 is located on the receiving container 2 as a fluid outlet, allowing the fluid injected into the elastic bladder 8 to be discharged from the cavity 11, thus forming a continuous fluid circulation loop. This reflux port 10 is typically connected to an external fluid source via a pipe. The external fluid source not only provides fluid injection but also receives the fluid discharged from the reflux port 10, forming a closed or open circulation system. To allow fluid to enter the reflux port 10 from the cavity 11 of the elastic bladder 8, the fixing part 3, in addition to the fluid channel 6 for fluid injection, also has a dedicated circulation channel. This circulation channel connects the cavity 11 to the reflux port 10, ensuring that the fluid can be discharged after flowing inside the cavity 11. After entering the cavity 11 of the elastic bladder 8 through the outlet 7 of the fixing part 3, the fluid flows inside the cavity 11, absorbing heat from the inner wall of the elastic bladder 8, and is then guided through the circulation channel in the fixing part 3 to the reflux port 10 on the receiving container 2 and discharged from the cavity 11.

[0041] There is a certain pressure difference or fluid driving force between the liquid outlet 7 and the return circulation port 10 to maintain the continuous flow of fluid. Whether the elastic bladder 8 is in the retracted state and retreated into the receiving cavity 4, or in the blocked state, the elastic bladder 8 expands and cuts off the internal channel of the exhaust pipe 5, the external fluid can continuously flow through the bladder cavity 11 and exchange heat with the inner wall of the elastic bladder 8, thereby forming convective cooling.

[0042] Convection cooling can efficiently and actively remove the heat absorbed by the elastic bladder 8 when it comes into contact with high-temperature exhaust gas, reduce the working temperature of the elastic bladder 8, effectively inhibit the thermal aging process of the elastic material, thereby improving the durability, reliability and service life of the elastic bladder 8, and ensuring the stable operation of the vehicle exhaust system sealing device under long-term high-temperature conditions.

[0043] The return circulation port 10 and the liquid outlet 7 are respectively connected to an external fluid source through pipes, and the expansion and contraction of the elastic bladder 8 are controlled by adjusting the flow difference between the return circulation port 10 and the liquid outlet 7.

[0044] like Figure 1 , Figure 4As shown, both the return circulation port 10 and the outlet 7 are connected to an external fluid source via independent pipes. The external fluid source can be a hydraulic pump station, a storage tank with a pump set, or a fluid management unit with pressure regulation and flow control capabilities. This independent connection method provides the basis for subsequent flow control, ensuring independent controllability of the fluid entering and exiting the elastic bladder 8 cavity 11.

[0045] The expansion and contraction of the elastic bladder 8 are controlled by precisely adjusting the difference between the fluid flow rate entering the outlet 7 and the fluid flow rate exiting the return circulation port 10. When the elastic bladder 8 needs to expand to achieve blockage, the flow rate entering the outlet 7 can be increased to exceed the discharge flow rate of the return circulation port 10, thereby establishing positive pressure within the bladder cavity 11 and driving the elastic bladder 8 to expand outward. Conversely, when the elastic bladder 8 needs to contract and retreat into the receiving cavity 4, the flow rate entering the outlet 7 can be reduced to be less than the discharge flow rate of the return circulation port 10, or the fluid supply to the outlet 7 can be completely stopped while maintaining discharge from the return circulation port 10, thereby reducing the pressure within the bladder cavity 11 and causing the elastic bladder 8 to retract under its own elasticity or external restoring force. This flow difference control enables precise and dynamic management of the expansion and contraction process of the elastic bladder 8.

[0046] Because fluid circulation continues throughout the process, even when the elastic bladder 8 is in a stable blocked or retracted state, fluid can continue to flow through the bladder cavity 11, carrying away the heat absorbed by the elastic bladder 8. This effectively maintains the low-temperature operating environment of the elastic bladder 8, extends its service life, and improves the long-term reliability of the device under complex operating conditions. Through the flow difference control mechanism, the system can flexibly adjust the internal pressure of the elastic bladder 8 according to actual needs, thereby optimizing the response speed and stability of the blocking and retracting processes.

[0047] In addition, the surface of the elastic bladder 8 has a preset folding texture, which guides the elastic bladder 8 to collapse and fold along a preset path in the stored state to pass through the window 1 and enter the storage cavity 4. The preset folding texture refers to the concave and convex structures, creases, or grooves of a specific geometry formed by design and manufacturing on the outer or inner surface of the elastic bladder 8. These textures are not randomly formed, but are designed so that when the elastic bladder 8 contracts, its material can be guided to fold in an orderly manner along a predetermined path.

[0048] For example, the fold texture can be formed by molding during the molding of the elastic bladder 8, or it can be achieved through subsequent surface etching or machining. The shape of the fold texture can be diverse, such as creases radiating from the top 12 of the elastic bladder to the root, or grooves spiraling upwards around the bladder body. Its specific design can be configured according to the geometry of the elastic bladder 8, the contraction path, and the desired folding effect. With the preset fold texture, the elastic bladder 8 can collapse and fold along the preset path in the storage state, thus smoothly passing through the window 1 into the storage cavity 4.

[0049] The circumferential edge of window 1 is provided with a rounded corner transition structure; the multiple liquid outlets 7 provided in the fixing part 3 are distributed radially or spirally, so that the injected fluid is sprayed into the inner cavity of the elastic bladder 8.

[0050] Specifically, the circumferential edges of window 1 are rounded to form a smooth arc transition. This can be achieved through machining, mold forming, or post-weld grinding, eliminating stress concentration points at the edges of window 1 and providing a smooth, continuous contact surface for the elastic bladder 8 during expansion and contraction. When the elastic bladder 8 passes through window 1 and expands, the rounded transition structure disperses the local pressure acting on the bladder wall, preventing the bladder wall from being sheared or worn at sharp edges, thus effectively protecting the integrity of the elastic bladder 8 and extending its service life.

[0051] Meanwhile, the radial distribution of multiple liquid outlets 7 on the fixing part 3 means that the multiple liquid outlets 7 are arranged radially and evenly around the center of the fixing part 3; the spiral distribution means that the multiple liquid outlets 7 are arranged along a spiral path along the surface of the fixing part 3. The radial or spiral distribution optimizes the coverage and flow pattern of the fluid within the elastic bladder 8. The fluid injected into the elastic bladder 8 can be evenly sprayed onto the entire inner wall surface of the elastic bladder 8, avoiding the formation of stagnant water zones or areas of insufficient cooling within the bladder cavity 11. Through uniform spraying, the fluid can more efficiently remove the heat absorbed by the inner wall of the elastic bladder 8, achieving a more comprehensive convective cooling effect, thereby reducing the overall operating temperature of the elastic bladder 8 and slowing down the thermal aging process of the material. For example, the liquid outlets 7 of the fixing part 3 can be configured as multiple micro-nozzles, with their spray direction slightly biased towards the inner wall of the elastic bladder 8 to enhance the spraying effect.

[0052] Multiple storage boxes are provided, spaced upwards along the internal channel of the exhaust pipe 5. Two or more independent storage containers 2 are disposed on the wall of the exhaust pipe 5. Each storage container 2 can independently accommodate a set of sealing components, including a fixing part 3 and an elastic bladder 8, providing redundant sealing capacity. If one sealing unit fails, the others can still function, thereby improving the reliability of the entire exhaust system sealing.

[0053] Multiple storage containers 2 are arranged sequentially at certain intervals along the length of the exhaust pipe 5, i.e., along the axis of the internal channel of the exhaust pipe 5. This allows each sealing unit to have independent space during operation, avoiding mutual interference. Furthermore, it can form multi-point sealing at different axial positions of the exhaust pipe 5 according to actual needs, in order to meet the sealing requirements under different working conditions. For example, when a higher sealing level is required, multiple sealing units can be activated simultaneously, enhancing the system's adaptability to exhaust pipes 5 of different lengths or complexities. Even in longer exhaust pipes 5, it can ensure effective sealing at critical locations, improving the exhaust safety of the vehicle in wading or amphibious conditions.

[0054] Example 2 In another typical embodiment of the present invention, such as Figures 1-4 As shown, a vehicle is provided that utilizes a vehicle exhaust system sealing device as described in Example 1.

[0055] The vehicle integrates the exhaust system sealing device as shown in Example 1, enabling it to operate safely and efficiently in wading environments. The vehicle in this example can refer to any means of transportation that requires the exhaust system to be sealed or protected under specific operating conditions, such as amphibious vehicles, wading vehicles, amphibious engineering machinery, and special rescue vehicles.

[0056] The vehicle comprises a powertrain, transmission, body structure, and various auxiliary systems. Exhaust gases from the powertrain are discharged through the exhaust system. By cleverly integrating the exhaust system sealing device into the vehicle's exhaust pipe 5, the vehicle can dynamically control the sealing and opening of exhaust pipe 5 according to the needs of the actual operating environment, such as switching from land mode to wading mode. The coordinated operation of the vehicle's exhaust system sealing device with the vehicle's powertrain, control system, power system, and cooling system ensures that the fluid supply, control signal transmission, and thermal management of the sealing device are matched to the overall operating status of the vehicle. For example, the vehicle's control unit can automatically trigger or deactivate the exhaust system sealing device based on information such as water depth and driving mode detected by sensors.

[0057] Example 3 In another typical embodiment of the present invention, such as Figures 1-4 As shown, a method for operating a vehicle exhaust system sealing device is provided, for assembling a vehicle exhaust system sealing device as described in Example 1, comprising: During the sealing process, external fluid is controlled to enter the fluid channel 6 of the fixed part 3 and injected into the cavity 11 of the elastic bladder 8 through multiple outlets 7, driving the elastic bladder 8 to expand and enter the interior of the exhaust pipe 5 through the window 1, so as to cut off the internal channel of the exhaust pipe 5. During the storage process, the fluid inside the elastic bladder 8 is discharged, causing the elastic bladder 8 to retract and pass through the window 1 into the storage cavity 4, thereby releasing the blockage of the internal channel of the exhaust pipe 5.

[0058] Specifically, by activating an external fluid source such as a hydraulic pump or a water pump, fluid such as coolant is delivered to the fluid channel 6 inside the fixed part 3.

[0059] Fluid is continuously injected into the bladder cavity 11 through the outlet 7 and discharged through the return circulation port 10 on the receiving container 2 to form a fluid circulation, carrying away the heat of the elastic bladder 8. During the sealing process, the flow rate of the fluid injected into the outlet 7 is increased to be greater than the flow rate of the fluid discharged from the return circulation port 10, so as to establish the internal pressure of the bladder cavity 11 to drive the elastic bladder 8 to expand. During the receiving process, the flow rate of the fluid injected into the outlet 7 is reduced to be less than the flow rate of the fluid discharged from the return circulation port 10, so as to reduce the internal pressure of the bladder cavity 11 to drive the elastic bladder 8 to contract.

[0060] By establishing a dynamic fluid circulation loop, cooling fluid can continuously flow through the internal cavity 11 of the elastic bladder 8. This fluid circulation loop typically consists of an external fluid source, a fluid channel 6 connected to the fixed part 3 and an outlet 7, the cavity 11 of the elastic bladder 8, and a return circulation port 10 on the receiving container 2. The external fluid source can be the vehicle's own cooling system, such as the engine coolant circulation system, or it can be a separate fluid pump and reservoir. The fluid pump provides power, driving fluid from the external fluid source through the fluid channel 6 and multiple outlets 7 within the fixed part 3 into the cavity 11 of the elastic bladder 8. After convective heat exchange within the cavity 11, the fluid is discharged through the return circulation port 10 on the receiving container 2, ultimately returning to the external fluid source or cooling system for heat dissipation and recirculation. Through continuous fluid circulation, the heat absorbed by the elastic bladder 8 wall from the high-temperature exhaust gas can be effectively removed, thereby reducing the overall operating temperature of the elastic bladder 8, slowing down its thermal aging process, and ensuring its long-term stable operation in high-temperature environments.

[0061] By precisely controlling the difference in fluid flow between the injection outlet 7 and the return circulation port 10, accurate regulation of the pressure within the bladder cavity 11 is achieved. During the sealing process, by increasing the inlet flow rate, the elastic bladder 8 can smoothly and controllably expand to its final position, ensuring the reliability of the sealing. During the retraction process, by reducing the inlet flow rate, combined with the action of the elastic reset component 9, the elastic bladder 8 can quickly and accurately retract into the retraction cavity 4, avoiding impact or incomplete contraction caused by rapid fluid discharge, and improving the response speed and success rate of system state switching. The scheme combining dynamic fluid control and active cooling not only ensures the long-term stable operation of the elastic bladder 8, but also optimizes its performance under different operating modes, meeting the exhaust safety requirements of amphibious vehicles or wading vehicles under complex working conditions.

[0062] The above technical solution will be illustrated with more specific examples below: After amphibious vehicles travel at high speeds on land, they need to enter water to perform wading missions. In land mode, the vehicle's engine needs efficient exhaust to ensure power performance, and the exhaust system sealing device should be in the retracted state. However, before entering water, to prevent water from flowing back into the exhaust system, the device needs to be switched to the sealing state.

[0063] When traveling at high speeds on land, the elastic bladder 8 of the vehicle's exhaust system sealing device is in a retracted state. The elastic bladder 8 is completely retracted into the receiving cavity 4, located outside the internal passage of the exhaust pipe 5. At this time, the internal passage of the exhaust pipe 5 remains unobstructed, the exhaust back pressure does not increase, and the engine can operate at optimal efficiency, avoiding the increased flow resistance and carbon buildup risks caused by the sealing component occupying the exhaust passage for a long time in the prior art. The fixing part 3 is set in the receiving cavity 4, which has a fluid passage 6 inside and multiple liquid outlets 7 communicating with the fluid passage 6. The root of the elastic bladder 8 is sealed and fixed to the fixing part 3, and the bladder cavity 11 inside the elastic bladder 8 communicates with these liquid outlets 7. To ensure the reliability of the elastic bladder 8 in the retracted state, the receiving container 2 is provided with a return circulation port 10, which is connected to the bladder cavity 11 through the circulation channel in the fixing part 3 and connected to an external fluid source. Even when the container is in its stored state, external fluid can continuously enter the bladder cavity 11 through the liquid outlet 7 and be discharged through the return circulation port 10, forming a convective cooling cycle on the inner wall of the elastic bladder 8.

[0064] Meanwhile, the elastic bladder 8 is equipped with an elastic reset member 9, one end of which is connected to the inner wall of the top 12 of the elastic bladder away from the root 13, and the other end is connected to the fixing part 3. This elastic reset member 9 provides a resetting force that pulls towards the fixing part 3 when the elastic bladder 8 contracts. Combined with the pre-set folding texture on the surface of the elastic bladder 8, it guides the elastic bladder 8 to collapse and fold along a preset path in the retracted state, ensuring that it smoothly passes through the window 1 into the storage cavity 4, avoiding the problems of incomplete airbag contraction or jamming in the prior art. The circumferential edge of the window 1 has a rounded transition structure, reducing friction and potential damage to the elastic bladder 8 when passing through the window 1.

[0065] When the vehicle is about to enter the water, the exhaust system needs to be switched to a blocked state. At this time, the control system adjusts the external fluid source, increasing the fluid flow rate at the injection outlet 7 to be greater than the fluid flow rate discharged from the return circulation port 10. The pressure inside the bladder 11 then builds up and rises, driving the elastic bladder 8 to inflate. Under the action of fluid pressure, the elastic bladder 8 passes through the window 1 and inflates to cut off the internal passage of the exhaust pipe 5, thereby effectively preventing the backflow of external water.

[0066] When the vehicle completes a water crossing and needs to switch back to land mode, the control system reduces the fluid flow rate at the injection outlet 7 to be less than the fluid flow rate discharged from the return circulation port 10. The pressure inside the bladder cavity 11 decreases accordingly, and the elastic bladder 8 begins to contract under the combined action of the pulling force of the elastic reset member 9 and the pressure difference between the inside and outside of the bladder cavity 11. The pre-set folding texture on the surface of the elastic bladder 8 guides it to retract neatly along a predetermined path, smoothly passing through the window 1 and retreating into the receiving cavity 4, thus releasing the obstruction of the internal passage of the exhaust pipe 5.

[0067] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vehicle exhaust system sealing device, characterized in that, include: The window is located on the wall of the exhaust pipe; The storage container is sealed to the outer periphery of the window, and a storage cavity is formed inside the storage container. The fixing part is set inside the storage cavity, and has a fluid channel inside. The fixing part also has multiple liquid outlets that communicate with the fluid channel. The elastic bladder is sealed and fixed to the fixing part at the root, and the bladder cavity inside the elastic bladder is connected to the liquid outlet; the elastic bladder has a storage state and a blocking state. In the storage state, the elastic bladder retracts into the storage cavity. In the blocked state, external fluid is injected into the elastic bladder through the outlet of the fixed part, driving the elastic bladder to pass through the window and expand, thereby cutting off the internal passage of the exhaust pipe.

2. The vehicle exhaust system sealing device as described in claim 1, characterized in that, The elastic bladder is provided with an elastic reset member. One end of the elastic reset member is connected to the inner wall of the top of the elastic bladder away from the root of the elastic bladder, and the other end is connected to the fixing part. It is used to provide a reset force to pull the elastic bladder toward the fixing part when the fluid in the elastic bladder is discharged.

3. The vehicle exhaust system sealing device as described in claim 1, characterized in that, The storage container is provided with a reflux circulation port, which is connected to the bladder cavity through the circulation channel in the fixed part. The reflux circulation port is connected to an external fluid source. After the fluid enters the bladder cavity through the liquid outlet, it can be discharged from the bladder cavity through the reflux circulation port. When the elastic bladder is in the storage state or the blocked state, the external fluid flows through the bladder cavity to form convective cooling of the inner wall of the elastic bladder.

4. The vehicle exhaust system sealing device as described in claim 3, characterized in that, The reflux port and the liquid outlet are respectively connected to an external fluid source through pipes. The expansion and contraction of the elastic bladder are controlled by adjusting the flow difference between the reflux port and the liquid outlet.

5. The vehicle exhaust system sealing device as described in claim 2, 3, or 4, characterized in that, The surface of the elastic bladder has a preset folding texture, which guides the elastic bladder to collapse and fold along a preset path in the stored state so as to pass through the window and enter the storage cavity.

6. The vehicle exhaust system sealing device as described in claim 5, characterized in that, The window has a rounded corner transition structure along its circumferential edge; The fixing part has multiple liquid outlets arranged radially or spirally, so that the injected fluid is sprayed into the inner cavity of the elastic bladder.

7. The vehicle exhaust system sealing device as described in claim 1, characterized in that, The storage box is provided in multiple parts, which are spaced upward along the internal channel of the exhaust pipe.

8. A vehicle, characterized in that, Using the vehicle exhaust system sealing device as described in any one of claims 1-7.

9. A method for operating a vehicle exhaust system sealing device, used to assemble the vehicle exhaust system sealing device as described in any one of claims 1-7, characterized in that, include: During the sealing process, external fluid is controlled to enter the fluid channel of the fixed part and injected into the bladder cavity of the elastic bladder through multiple outlets, driving the elastic bladder to expand and enter the exhaust pipe through the window to cut off the internal channel of the exhaust pipe. During the retraction process, the fluid inside the elastic bladder is discharged, causing the elastic bladder to retract and pass through the window into the retraction cavity, thereby releasing the blockage of the internal passage of the exhaust pipe.

10. The method of operating the vehicle exhaust system sealing device as described in claim 9, characterized in that, Fluid is continuously introduced into the bladder cavity through the outlet and discharged through the return circulation port on the receiving container to form a fluid circulation, which removes heat from the elastic bladder. During the sealing process, the flow rate of the fluid injected into the outlet is increased to be greater than the flow rate of the fluid discharged from the return circulation port, so as to establish the intracavitary pressure to drive the elastic bladder to expand. During the storage process, the fluid flow rate at the injection outlet is reduced to be less than the fluid flow rate at the return circulation outlet, thereby reducing the intracavitary pressure and driving the elastic bladder to contract.

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