Pipe connection structure, exhaust system and vehicle

Abstract

The application provides a pipeline connecting structure, an exhaust system and a vehicle, and belongs to the technical field of vehicle exhaust systems. The pipeline connecting structure comprises a first connecting pipe and a second connecting pipe distributed along the airflow direction, and further comprises a sealing ring. By inserting the first pipe body into the second pipe body, the first pipe body can fully shield the gap between the second pipe body and the first flange, so that the high-temperature and high-pressure airflow in the pipeline flows into the second pipe body along the inside of the first pipe body and does not directly contact the sealing ring sleeved outside the second pipe body. The continuous scouring and erosion of the airflow on the sealing ring are avoided, the wear and aging of the sealing ring material are slowed down, and the sealing reliability is improved. At the same time, the sealing ring is sleeved outside the second pipe body downstream. Even in a non-horizontal installation environment in which the tail ends of the first pipe body and the second pipe body are inclined downward, the sealing ring can be stably clamped on the second pipe body downstream and will not slide down due to gravity. The problem that the sealing ring is prone to falling off during operation in a narrow space, thereby causing assembly obstruction, is solved.

Description

Technical Field

[0001] This application belongs to the field of vehicle exhaust system technology, and more specifically, relates to a pipe connection structure, an exhaust system, and a vehicle. Background Technology

[0002] The exhaust system, an indispensable component of a car, functions to guide, purify, and reduce the exhaust gases emitted by the engine. This system typically includes components such as a catalytic converter and a muffler, all connected by pipes.

[0003] To ensure the reliability and sealing of pipe connections, flanges are typically installed at the pipe ends, and sealing rings are fitted between the mating surfaces, with bolts used for tightening to achieve a seal. However, during assembly, especially on non-horizontal pipelines, the sealing rings are prone to displacement or detachment due to a lack of effective positioning, affecting the assembly and sealing effect. Existing technologies mainly offer two improvement solutions: Firstly, an annular sealing groove is created on the flange mating surface to embed the sealing ring. While this structure can prevent radial slippage during assembly, it exposes the side of the sealing ring directly to the high-temperature exhaust gas from the pipeline, making it susceptible to continuous scouring and erosion, accelerating material wear and aging, and affecting long-term sealing reliability.

[0004] Secondly, a limiting ring is installed on the flange end face upstream of the airflow. The sealing ring is fitted over the limiting ring, and then the limiting ring and the sealing ring are inserted into the downstream flange. The radial compression sealing of the sealing ring is achieved by the compressive force of the limiting ring and the downstream flange. However, although the above solution avoids airflow erosion and solves the positioning problem during horizontal installation, there is a necessary assembly gap between the inner diameter of the sealing ring and the outer diameter of the limiting ring. When the flange interface is installed downwards, the sealing ring will slip due to gravity and cannot be stably positioned, making it easy for the sealing ring to fall off during installation, especially when working in confined spaces. Utility Model Content

[0005] The purpose of this application is to provide a pipe connection structure, an exhaust system, and a vehicle, which aims to solve the problem that existing sealing rings are prone to falling off during assembly, resulting in low assembly efficiency.

[0006] In a first aspect, embodiments of this application provide a pipe connection structure, including a first connecting pipe and a second connecting pipe distributed along the airflow direction, and a sealing ring, wherein: The first connecting pipe includes a first pipe body and a first flange sleeved on the body of the first pipe body; the second connecting pipe includes a second pipe body and a second flange sleeved on the body of the second pipe body; the sealing ring is sleeved on the body of the second pipe body; and the first flange and the second flange press and fix the sealing ring along the airflow direction. The first tube is inserted into the second tube, and the end of the second tube abuts against the first flange. The first tube covers the gap between the second tube and the first flange.

[0007] Compared with existing technologies, the pipe connection structure provided in this application, during assembly, allows the first pipe body to be located upstream of the second pipe body and directly inserted into the second pipe body. This ensures that the first pipe body fully covers the gap between the second pipe body and the first flange, allowing the high-temperature, high-pressure exhaust gas in the pipeline to flow smoothly into the second pipe body along the interior of the first pipe body without directly contacting the sealing ring fitted on the outside of the second pipe body. This avoids continuous scouring and erosion of the sealing ring by the airflow, effectively slowing down the wear and aging of the sealing ring material and improving long-term sealing reliability. Furthermore, since the sealing ring is fixed to the downstream second pipe body, rather than relying on upstream components for positioning, even in non-horizontal installation environments where the ends of the first and second pipe bodies are tilted downwards, the sealing ring can be stably secured to the downstream second pipe body and will not slip off due to gravity. This solves the problem of sealing rings easily falling off and causing assembly obstruction in narrow spaces, significantly improving assembly efficiency. After the first flange and the second flange are pressed and fixed along the airflow direction, the sealing ring is tightly fitted to the sealing surface under the clamping force of the first flange and the second flange. The nested structure of the first pipe body and the second pipe body further enhances the stability of the sealing environment. This ensures that the sealing effect is not affected by the installation posture, and eliminates the need for additional complex positioning structures, simplifying the assembly process and providing a reliable guarantee for the efficient assembly and long-term stable operation of the automotive exhaust system.

[0008] In conjunction with the first aspect, in one possible implementation, the connecting surface of the second flange is provided with a receiving groove, and the sealing ring is disposed in the receiving groove and abuts against the first flange.

[0009] In the above technical solution, the receiving groove can precisely limit the radial and axial positioning of the sealing ring, effectively preventing it from shifting or falling off due to gravity or operational shaking during installation. This is particularly suitable for non-horizontal installation positions, thereby improving the convenience and reliability of assembly. The sealing ring is enclosed by the receiving groove and directly abuts against the end face of the first flange, allowing the clamping force generated when the first and second flanges are tightened to be evenly applied to the sealing ring, forming a more stable and uniform sealing interface and improving the airtightness of the connection. Furthermore, this design protects the sealing ring within the receiving groove, reducing its area directly exposed to high-temperature, high-speed airflow. This effectively reduces the erosion of the sealing material by airflow scouring and thermal aging, extending the service life of the sealing ring and enhancing the long-term sealing reliability of the entire exhaust system connection.

[0010] In conjunction with the first aspect, in one possible implementation, the connecting surface of the first flange is provided with a limiting groove corresponding to the receiving groove, and the limiting groove and the receiving groove cooperate to limit the sealing ring.

[0011] In the above technical solution, by creating corresponding limiting grooves and receiving grooves on the connection surfaces of the first flange and the second flange, the sealing ring is clamped and limited, preventing radial movement or detachment due to gravity during assembly. This improves the ease of assembly and success rate in complex situations such as limited space or downward tilting of the pipe end. Simultaneously, this solution effectively prevents irregular deformation of the sealing ring during the tightening process, optimizing the distribution of sealing pressure, improving the immediate sealing effect, and structurally ensuring the sealing reliability of the connection under long-term vibration and high-temperature conditions.

[0012] In conjunction with the first aspect, in one possible implementation, the first pipe body includes an air inlet, a transition section, and a connecting section arranged sequentially along the airflow direction. The outer diameter of the air inlet is larger than the outer diameter of the connecting section. The first flange is sleeved outside the connecting section, and the connecting section is inserted into the second pipe body.

[0013] In the above technical solution, the outer diameter of the intake section is larger than that of the connecting section, ensuring that the connecting section of the first pipe can be smoothly inserted into the second pipe while avoiding affecting the flow rate of gas within the intake section. Furthermore, this tapered design effectively guides airflow through a smooth transition, reducing turbulence and local resistance, thereby improving the fluid performance of the exhaust system while maintaining structural strength.

[0014] In conjunction with the first aspect, in one possible implementation, the portion of the first tube body inserted into the second tube body forms an insertion portion, the thickness of which gradually decreases along the airflow direction.

[0015] In the above technical solution, the insertion part has a gradually increasing thickness along the airflow direction. This smoothly transitioning conical design helps guide the airflow smoothly within the pipe body, reducing eddies and turbulence caused by abrupt changes in cross-section at the connection between the first and second pipe bodies. This reduces flow resistance and pressure loss, optimizing the aerodynamic performance of the exhaust system. This solution eliminates the need for additional guide components or complex airflow guiding structures, simplifying the structure while achieving multiple improvements in assembly convenience, connection stability, and aerodynamic performance, thus balancing practicality and economy.

[0016] In conjunction with the first aspect, in one possible implementation, the outer peripheral surfaces of the first flange and the second flange each have corresponding positioning grooves, and / or the outer peripheral surfaces of the first flange and the second flange each have corresponding positioning protrusions. The corresponding positioning grooves or the corresponding positioning protrusions enable the positioning and assembly of the first flange and the second flange.

[0017] In the above technical solution, during assembly, simply aligning the positioning protrusions of the first and second flanges with each other, and / or aligning the positioning grooves of the first and second flanges with each other, quickly completes the alignment and positioning. Furthermore, because this solution forms a positioning structure on the outer circumferential surfaces of the first and second flanges, alignment is convenient in confined spaces, eliminating the need for repeated adjustments to the flange angles and positions, reducing assembly difficulty, and improving work efficiency.

[0018] In conjunction with the first aspect, in one possible implementation, the first flange and the second flange have corresponding connection holes, and the pipe connection structure further includes a locking nut connected to the first flange and / or the second flange, the inner hole of the locking nut corresponding to the connection hole.

[0019] In the above technical solution, the inner hole of the locking nut corresponds to the connecting hole, and the locking nut is pre-connected to the first flange and / or the second flange, which increases the local strength of the first flange and / or the second flange. When the locking bolt is inserted into the connecting hole and locks the first flange and the second flange, the periphery of the connecting hole bears a large stress. This solution can avoid deformation or damage to the area around the connecting hole and improve the stress intensity of the area.

[0020] In conjunction with the first aspect, in one possible implementation, the first flange is further provided with an assembly groove, which radially connects the limiting groove to the inner hole of the first flange, and the end of the second pipe is inserted into the assembly groove and covers the sealing ring.

[0021] In the above technical solution, during the assembly of the sealing ring, the sealing ring is fitted onto the body of the second tube and embedded in the receiving groove. Since the end of the second tube needs to be inserted into the assembly groove, the second tube has sufficient axial dimensions to limit the sealing ring, preventing it from detaching during assembly. After the first tube is inserted into the second tube, the end of the second tube, inserted into the assembly groove, shields the sealing ring, further reducing the chance of high-temperature airflow eroding the sealing ring.

[0022] Secondly, embodiments of this application also provide an exhaust system, including the aforementioned pipe connection structure.

[0023] The beneficial effects of the exhaust system provided in this application are as follows: Compared with the prior art, the above-mentioned pipe connection structure, because the first pipe body is located upstream of the second pipe body and is directly inserted into the second pipe body during assembly, allows the first pipe body to fully cover the gap between the second pipe body and the first flange. This allows the high-temperature and high-pressure exhaust gas flow in the pipeline to flow smoothly into the second pipe body along the inside of the first pipe body without directly contacting the sealing ring fitted on the outside of the second pipe body. This avoids continuous scouring and erosion of the sealing ring by the airflow, effectively slows down the wear and aging of the sealing ring material, and improves long-term sealing reliability. At the same time, the sealing ring is fitted and fixed on the downstream second pipe body, rather than relying on upstream components for positioning. Even in non-horizontal installation environments where the tail ends of the first and second pipe bodies are tilted downwards, the sealing ring can be stably locked on the downstream second pipe body and will not slip off due to gravity. This solves the problem of the sealing ring easily falling off and causing assembly obstruction when working in narrow spaces, significantly improving assembly efficiency. After the first flange and the second flange are pressed and fixed along the airflow direction, the sealing ring is tightly fitted to the sealing surface under the clamping force of the first flange and the second flange. The nested structure of the first pipe body and the second pipe body further enhances the stability of the sealing environment. This ensures that the sealing effect is not affected by the installation posture, and eliminates the need for additional complex positioning structures, simplifying the assembly process and providing a reliable guarantee for the efficient assembly and long-term stable operation of the automotive exhaust system.

[0024] Thirdly, embodiments of this application also provide a vehicle including the exhaust system described above.

[0025] The beneficial effects of the vehicle provided in this application are as follows: Compared with the prior art, the exhaust system described above, because the first pipe body is located upstream of the second pipe body and is directly inserted into the second pipe body during assembly, allows the first pipe body to fully cover the gap between the second pipe body and the first flange. This enables the high-temperature, high-pressure exhaust gas flow in the pipeline to flow smoothly into the second pipe body along the inside of the first pipe body without directly contacting the sealing ring fitted on the outside of the second pipe body. This avoids continuous scouring and erosion of the sealing ring by the airflow, effectively slowing down the wear and aging of the sealing ring material and improving long-term sealing reliability. Simultaneously, the sealing ring is fixed to the downstream second pipe body, rather than relying on upstream components for positioning. Even in non-horizontal installation environments where the tail ends of the first and second pipe bodies are tilted downwards, the sealing ring can be stably secured to the downstream second pipe body and will not slip off due to gravity. This solves the problem of the sealing ring easily falling off and causing assembly obstruction when working in narrow spaces, significantly improving assembly efficiency. After the first flange and the second flange are pressed and fixed along the airflow direction, the sealing ring is tightly fitted to the sealing surface under the clamping force of the first flange and the second flange. The nested structure of the first pipe body and the second pipe body further enhances the stability of the sealing environment. This ensures that the sealing effect is not affected by the installation posture, and eliminates the need for additional complex positioning structures, simplifying the assembly process and providing a reliable guarantee for the efficient assembly and long-term stable operation of the automotive exhaust system. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the pipe connection structure provided in the embodiments of this application; Figure 2 This is a front view of the pipe connection structure provided in an embodiment of this application; Figure 3 For along Figure 2 Cross-sectional view of line AA in the middle; Figure 4 for Figure 3 A magnified view of part A in the image; Figure 5 This is a partial enlarged view of the first connecting pipe used in another embodiment of this application; Figure 6 This is a partial cross-sectional view of the first connecting pipe and the second connecting pipe used in the embodiments of this application.

[0028] In the diagram: 1. First connecting pipe; 101. First pipe body; 1011. Air inlet; 1012. Transition section; 1013. Connecting section; 1014. Insertion section; 102. First flange; 1021. Positioning groove; 1022. Positioning protrusion; 1023. Connecting hole; 1024. Limiting groove; 1025. Assembly groove; 2. Second connecting pipe; 201. Second pipe body; 202. Second flange; 2021. Receiving groove; 3. Locking nut; 301. Locking part; 302. Fixing part; 4. Sealing ring. Detailed Implementation

[0029] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0030] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a few" means two or more, unless otherwise explicitly specified.

[0032] It should be noted that the directions or positional relationships indicated by "front", "rear", "inner", "outer", "up", and "down" in this embodiment are based on the vehicle's own orientation. The front of the vehicle represents "front", the rear of the vehicle represents "rear", the top of the vehicle represents "up", the bottom of the vehicle represents "down", the "inner" side refers to the side facing the driver's cab, and the "outer" side refers to the side facing the driver's cab.

[0033] In addition, the front-rear direction of the vehicle body as defined in the embodiments of this application refers to the front-rear direction of the vehicle's forward direction during driving; the left-right direction of the vehicle body as defined refers to the left-right direction of the vehicle's forward direction during driving; and the up-down direction of the vehicle body as defined refers to the up-down direction of the vehicle's forward direction during driving.

[0034] Please refer to the following: Figures 1 to 6 The following describes the pipe connection structure, exhaust system, and vehicle provided in this application. The pipe connection structure includes a first connecting pipe 1 and a second connecting pipe 2 distributed in the airflow direction, and also includes a sealing ring 4. The first connecting pipe 1 includes a first pipe body 101 and a first flange 102 sleeved on the first pipe body 101. The second connecting pipe 2 includes a second pipe body 201 and a second flange 202 sleeved on the second pipe body 201. The sealing ring 4 is sleeved on the second pipe body 201, and the first flange 102 and the second flange 202 press and fix the sealing ring 4 along the airflow direction. The first pipe body 101 is inserted into the second pipe body 201, and the end of the second pipe body 201 abuts against the first flange 102. The first pipe body 101 covers the gap between the second pipe body 201 and the first flange 102.

[0035] Compared with the prior art, the pipe connection structure provided in this application, during the assembly process, since the first pipe body 101 is located upstream of the second pipe body 201 and is directly inserted into the second pipe body 201 during assembly, allows the first pipe body 101 to fully cover the gap between the second pipe body 201 and the first flange 102. This allows the high-temperature and high-pressure exhaust gas flow in the pipeline to flow smoothly into the second pipe body 201 along the inside of the first pipe body 101 without directly contacting the sealing ring 4 sleeved on the outside of the second pipe body 201. This avoids the continuous scouring and erosion of the sealing ring 4 by the airflow, effectively slows down the wear and aging of the sealing ring 4 material, and improves the long-term sealing reliability. Meanwhile, the sealing ring 4 is fitted and fixed to the downstream second pipe body 201, rather than relying on upstream components for positioning. Even in non-horizontal installation environments where the tail ends of the first pipe body 101 and the second pipe body 201 are tilted downwards, the sealing ring 4 can be stably locked onto the downstream second pipe body 201 and will not slip off due to gravity. This solves the problem of the sealing ring 4 easily falling off and causing assembly obstruction when working in narrow spaces, significantly improving assembly efficiency. After the first flange 102 and the second flange 202 are pressed and fixed along the airflow direction, the sealing ring 4 tightly fits the sealing surface under the clamping force of the first flange 102 and the second flange 202. Combined with the nested structure of the first pipe body 101 and the second pipe body 201, this further enhances the stability of the sealing environment. It ensures that the sealing effect is not affected by the installation posture and eliminates the need for additional complex positioning structures, simplifying the assembly process and providing a reliable guarantee for the efficient assembly and long-term stable operation of the automotive exhaust system.

[0036] Optionally, the first flange 102 and the first pipe body 101 can be an integral component or fixedly connected by welding or other methods; the second flange 202 and the second pipe body 201 can be an integral component or fixedly connected by welding or other methods.

[0037] Please see Figures 3 to 4 ,and Figure 6 In some embodiments, the connecting surface of the second flange 202 is provided with a receiving groove, and the sealing ring 4 is disposed in the receiving groove and abuts against the first flange 102.

[0038] The receiving groove provides positioning space for the sealing ring 4. During assembly, the sealing ring 4 can be directly embedded in the receiving groove without additional alignment adjustments, preventing the sealing ring 4 from shifting during assembly. Especially in non-horizontal installation scenarios, the receiving groove can limit the sealing ring 4, and together with its fixing method of being fitted onto the second pipe body 201, it avoids the risk of falling off, improving assembly efficiency in confined spaces. At the same time, when the first flange 102 and the second flange 202 are pressed and fixed, the receiving groove can limit the compression deformation range of the sealing ring 4, so that the sealing ring 4 is evenly stressed in the receiving groove and tightly abuts against the first flange 102, forming a stable sealing contact surface and preventing seal failure due to uneven deformation.

[0039] Please see Figure 4 and Figure 6 In some embodiments, the connecting surface of the first flange 102 is provided with a limiting groove corresponding to the receiving groove, and the limiting groove and the receiving groove cooperate to limit the sealing ring 4.

[0040] The limiting groove precisely corresponds to the receiving groove of the second flange 202. During assembly, the sealing ring 4 can be simultaneously embedded in the closed space formed by the limiting groove and the receiving groove, achieving clamping and positioning. This solution not only prevents the sealing ring 4 from shifting or falling off during assembly, but also limits the lateral and longitudinal deformation range of the sealing ring 4 during the locking stage of the first flange 102 and the second flange 202, preventing it from twisting or shifting due to excessive extrusion or uneven force, ensuring that the sealing ring 4 always maintains the optimal sealing posture and improving sealing reliability. At the same time, the sealed chamber formed by the limiting groove and the receiving groove can further isolate the interference of high-temperature exhaust gas in the pipeline. Combined with the nested shielding structure of the first pipe body 101, it forms multiple protective barriers, reducing the erosion of the sealing ring 4 by airflow, slowing down the aging rate of the material, and extending the service life of the sealing structure. In addition, the alignment of the limiting groove and the receiving groove can also provide guidance for the assembly of the first flange 102 and the second flange 202, helping to quickly align and install, and simplifying the assembly process.

[0041] Please see Figure 3 In some embodiments, the first pipe body 101 includes an air inlet 1011, a transition section 1012 and a connecting section 1013 arranged sequentially along the airflow direction. The outer diameter of the air inlet 1011 is larger than the outer diameter of the connecting section 1013. The first flange 102 is sleeved on the outside of the connecting section 1013, and the connecting section 1013 is inserted into the second pipe body 201.

[0042] The outer diameter of the connecting part 1013 is smaller than that of the air inlet 1011 and is adapted to the inner diameter of the second pipe body 201. This not only enables nesting with the second pipe body 201, but also reduces the connection gap between the first pipe body 101 and the second pipe body 201 through precise dimensional adaptation. Combined with the shielding effect of the first pipe body 101 on the gap between the second pipe body 201 and the first flange 102, a smooth and continuous airflow channel is formed, allowing the high-temperature exhaust gas to flow smoothly along the inside of the pipe body. This avoids the formation of eddies or turbulence in the airflow at the connection gap, further blocking the leakage path of the high-temperature exhaust gas and preventing turbulent airflow from causing localized strong impact and erosion on the sealing ring 4, thus strengthening the sealing protection effect. At the same time, the larger outer diameter of the air inlet 1011 can enhance the overall rigidity of the pipe body, reduce the vibration of the first pipe body 101 under the impact of airflow, and prevent the vibration from causing dynamic changes in the pipe body connection gap, thereby preventing the risk of airflow leakage from escalating. This indirectly improves the stability and durability of the connection structure without the need for additional reinforcement components. It simplifies the structure while optimizing the airflow state and improving the sealing reliability.

[0043] Please see Figure 5 In some embodiments, the portion of the first tube 101 inserted into the second tube 201 forms an insertion portion 1014, and the thickness of the insertion portion 1014 gradually decreases along the airflow direction.

[0044] The insertion section 1014 has a gradually increasing thickness along the airflow direction. This smoothly transitioning conical design helps guide the airflow smoothly within the pipe body, reducing eddies and turbulence caused by abrupt changes in cross-section at the connection between the first pipe body 101 and the second pipe body 201. This reduces flow resistance and pressure loss, optimizing the aerodynamic performance of the exhaust system. This solution eliminates the need for additional guide components or complex airflow guiding structures, simplifying the structure while achieving multiple improvements in assembly convenience, connection stability, and aerodynamic performance, thus balancing practicality and economy.

[0045] Please see Figures 1 to 2 In some embodiments, the outer peripheral surfaces of the first flange 102 and the second flange 202 respectively have corresponding positioning grooves 1021 and / or positioning protrusions 1022. The positioning grooves 1021 or the positioning protrusions 1022 correspond to each other to realize the positioning and assembly of the first flange 102 and the second flange 202.

[0046] During assembly, simply aligning the positioning protrusions 1022 of the first flange 102 and the second flange 202 with each other, and / or aligning the positioning grooves 1021 of the first flange 102 and the second flange 202 with each other, quickly completes the alignment and positioning. Furthermore, because this design forms a positioning structure on the outer circumferential surfaces of the first flange 102 and the second flange 202, and facilitates alignment in confined spaces, it eliminates the need for repeated adjustments to the flange angles and positions, reducing assembly difficulty and improving work efficiency.

[0047] Please see Figures 1 to 2 In some embodiments, the first flange 102 and the second flange 202 are provided with corresponding connection holes 1023. The pipe connection structure also includes a locking nut 3 connected to the first flange 102 and / or the second flange 202, and the inner hole of the locking nut 3 corresponds to the connection hole 1023.

[0048] The inner hole of the locking nut 3 corresponds to the connecting hole 1023 and is pre-connected to the first flange 102 and / or the second flange 202, which increases the local strength of the first flange 102 and / or the second flange 202. When the locking bolt is inserted into the connecting hole 1023 and locks the first flange 102 and the second flange 202, the periphery of the connecting hole 1023 bears a large stress. This solution can avoid deformation or damage to the area around the connecting hole 1023 and improve the stress strength of this area.

[0049] Furthermore, if the locking nut 3 has internal threads, the assembler can directly pass the bolt through the aligned connecting hole 1023 and the inner hole of the locking nut 3 to quickly complete the locking operation. Especially in narrow spaces or non-horizontal installation scenarios, there is no need to manually align the nut, avoiding problems such as the nut falling or misaligning, significantly improving assembly efficiency and operational safety. At the same time, the pre-connected locking nut 3 can prevent it from being lost or shifted during assembly.

[0050] Specifically, the locking nut 3 is located on the side of the first flange 102 or the second flange 202 away from the connecting surface.

[0051] Optionally, the locking nut 3 may or may not have internal threads.

[0052] Please see Figure 6 In some embodiments, the first flange 102 is also provided with an assembly groove 1025, which connects the limiting groove 1024 to the inner hole of the first flange 102 in a radial direction. The end of the second pipe body 201 is inserted into the assembly groove 1025 and covers the sealing ring 4.

[0053] When assembling the sealing ring 4, the sealing ring 4 is sleeved on the outside of the second tube 201 and embedded in the receiving groove 2021. Since the end of the second tube 201 needs to be inserted into the assembly groove 1025, the second tube 201 has sufficient axial dimensions to limit the sealing ring 4 and prevent the sealing ring 4 from detaching from the second tube 201 during assembly. After the first tube 101 is inserted into the second tube 201, the end of the second tube 201 inserted into the assembly groove 1025 shields the sealing ring 4, further reducing the chance of high-temperature airflow eroding the sealing ring 4.

[0054] Please see Figures 1 to 2 In some embodiments, the locking nut 3 includes a fixing part 302 and a locking part 301 connected to the fixing part 302. The fixing part 302 is connected to the first flange 102 or the second flange 202, and the outer peripheral surface of the fixing part 302 protrudes outward from the outer peripheral surface of the locking part 301.

[0055] The fixing part 302 increases the contact area between the locking nut 3 and the first flange 102 or the second flange 202, which not only improves the stability and reliability of the connection, but also avoids the local stress concentration caused by traditional small-area connections. It effectively prevents the locking nut 3 from loosening, deforming or even falling off the connection between the flange and the flange due to pipeline vibration, airflow impact or repeated locking operations during long-term use, and significantly improves the stability and durability of the connection between the locking nut 3 and the flange.

[0056] Based on the same inventive concept, this application also provides an exhaust system. The exhaust system includes the above-described pipe connection structure.

[0057] The exhaust system provided by this utility model adopts the above-mentioned pipe connection structure. Since the first pipe body 101 is located upstream of the second pipe body 201, and the first pipe body 101 is directly inserted into the second pipe body 201 during assembly, the first pipe body 101 can fully cover the gap between the second pipe body 201 and the first flange 102. This allows the high-temperature and high-pressure exhaust gas flow in the pipeline to flow smoothly into the second pipe body 201 along the inside of the first pipe body 101 without directly contacting the sealing ring 4 sleeved on the outside of the second pipe body 201. This avoids the continuous scouring and erosion of the sealing ring 4 by the airflow, effectively slows down the wear and aging of the sealing ring 4 material, and improves the long-term sealing reliability. Meanwhile, the sealing ring 4 is fitted and fixed to the downstream second pipe body 201, rather than relying on upstream components for positioning. Even in non-horizontal installation environments where the tail ends of the first pipe body 101 and the second pipe body 201 are tilted downwards, the sealing ring 4 can be stably locked onto the downstream second pipe body 201 and will not slip off due to gravity. This solves the problem of the sealing ring 4 easily falling off and causing assembly obstruction when working in narrow spaces, significantly improving assembly efficiency. After the first flange 102 and the second flange 202 are pressed and fixed along the airflow direction, the sealing ring 4 tightly fits the sealing surface under the clamping force of the first flange 102 and the second flange 202. Combined with the nested structure of the first pipe body 101 and the second pipe body 201, this further enhances the stability of the sealing environment. It ensures that the sealing effect is not affected by the installation posture and eliminates the need for additional complex positioning structures, simplifying the assembly process and providing a reliable guarantee for the efficient assembly and long-term stable operation of the automotive exhaust system.

[0058] Based on the same inventive concept, this application also provides a vehicle. The vehicle includes the exhaust system described above.

[0059] The vehicle provided by this utility model adopts the aforementioned exhaust system. Since the first pipe body 101 is located upstream of the second pipe body 201, and is directly inserted into the second pipe body 201 during assembly, the first pipe body 101 can fully cover the gap between the second pipe body 201 and the first flange 102. This allows the high-temperature, high-pressure exhaust gas flow in the pipeline to smoothly flow into the second pipe body 201 along the interior of the first pipe body 101, without directly contacting the sealing ring 4 fitted outside the second pipe body 201. This avoids continuous scouring and erosion of the sealing ring 4 by the airflow, effectively slowing down the wear and aging of the sealing ring 4 material and improving long-term sealing reliability. Simultaneously, the sealing ring 4 is fixed to the downstream second pipe body 201, rather than relying on upstream components for positioning. Even in non-horizontal installation environments where the tail ends of the first pipe body 101 and the second pipe body 201 are tilted downwards, the sealing ring 4 can be stably secured to the downstream second pipe body 201 and will not slip off due to gravity. This solves the problem of the sealing ring 4 easily falling off and causing assembly obstruction when working in narrow spaces, significantly improving assembly efficiency. After the first flange 102 and the second flange 202 are pressed and fixed along the airflow direction, the sealing ring 4 tightly fits the sealing surface under the clamping force of the first flange 102 and the second flange 202. The nested structure of the first pipe body 101 and the second pipe body 201 further enhances the stability of the sealing environment. This ensures that the sealing effect is not affected by the installation posture, and there is no need to set up a complex positioning structure. This simplifies the assembly process and provides a reliable guarantee for the efficient assembly and long-term stable operation of the automotive exhaust system.

[0060] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pipe connection structure, characterized in that, It includes a first connecting pipe (1) and a second connecting pipe (2) distributed along the airflow direction, and also includes a sealing ring (4), wherein: The first connecting pipe (1) includes a first pipe body (101) and a first flange (102) sleeved outside the first pipe body (101). The second connecting pipe (2) includes a second pipe body (201) and a second flange (202) sleeved outside the second pipe body (201). The sealing ring (4) is sleeved outside the second pipe body (201), and the first flange (102) and the second flange (202) press and fix the sealing ring (4) along the airflow direction. The first tube (101) is inserted into the second tube (201), and the end of the second tube (201) abuts against the first flange (102). The first tube (101) covers the gap between the second tube (201) and the first flange (102).

2. The pipe connection structure as described in claim 1, characterized in that, The second flange (202) has a receiving groove (2021) on its connecting surface, and the sealing ring (4) is located in the receiving groove (2021) and abuts against the first flange (102).

3. The pipe connection structure as described in claim 2, characterized in that, The connecting surface of the first flange (102) is provided with a limiting groove (1024) corresponding to the receiving groove (2021), and the limiting groove (1024) and the receiving groove (2021) cooperate to limit the sealing ring (4).

4. The pipe connection structure as described in claim 1, characterized in that, The first pipe body (101) includes an air inlet (1011), a transition section (1012), and a connecting section (1013) arranged sequentially along the airflow direction. The outer diameter of the air inlet (1011) is larger than the outer diameter of the connecting section (1013). The first flange (102) is sleeved on the outside of the connecting section (1013), and the connecting section (1013) is inserted into the second pipe body (201).

5. The pipe connection structure as described in claim 1, characterized in that, The portion of the first tube (101) inserted into the second tube (201) forms an insertion portion (1014), and the thickness of the insertion portion (1014) gradually decreases along the airflow direction.

6. The pipe connection structure as described in claim 1, characterized in that, The outer peripheral surfaces of the first flange (102) and the second flange (202) are respectively provided with corresponding positioning grooves (1021), and / or the outer peripheral surfaces of the first flange (102) and the second flange (202) are respectively provided with corresponding positioning protrusions (1022). The positioning grooves (1021) and the positioning protrusions (1022) are respectively provided with corresponding positioning grooves to achieve the positioning and assembly of the first flange (102) and the second flange (202).

7. The pipe connection structure as described in claim 1, characterized in that, The first flange (102) and the second flange (202) are provided with corresponding connection holes (1023). The pipe connection structure also includes a locking nut (3) connected to the first flange (102) and / or the second flange (202), and the inner hole of the locking nut (3) corresponds to the connection hole (1023).

8. The pipe connection structure as described in claim 3, characterized in that, The first flange (102) is also provided with an assembly groove (1025), which connects the limiting groove (1024) to the inner hole of the first flange (102) in a radial direction. The end of the second pipe body (201) is inserted into the assembly groove (1025) and covers the sealing ring (4).

9. An exhaust system, characterized in that, The pipe connection structure has any one of claims 1-8.

10. A vehicle, characterized in that, It has the exhaust system described in claim 9.

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