Pipe connection structure assembly, exhaust system and vehicle

Abstract

The application provides a pipe connecting structure assembly, an exhaust system and a vehicle, and belongs to the technical field of automobile exhaust systems. A rigid covering ring is formed by the clamping of the first clamp and the second clamp, and the axial mechanical stop is formed by the cooperation of the clamp limiting step and the pipe limiting step, thereby achieving the purpose of rigid radial limiting and rigid axial limiting of the second pipe. The first pipe and the second pipe are locked by mechanical interlocking, the connection reliability is effectively improved, and the risk of the second pipe being pulled out during driving is effectively avoided. By adopting the scheme that the first clamp is embedded in the extension, the reliable contact of the clamp limiting step and the pipe limiting step is ensured, and the risk of damage or sealing failure of the first pipe due to extrusion is reduced. By setting a U-shaped limiting sleeve ring on the butt joint side of the first clamp, the assembler can achieve one-handed operation, and the operation process is simplified.

Description

Technical Field

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

[0002] The exhaust system is a crucial component of modern internal combustion engine vehicles. It is primarily responsible for safely and effectively guiding and discharging the high-temperature, high-pressure exhaust gases generated by engine combustion into the atmosphere. It also uses a three-way catalytic converter to transform the main harmful pollutants in the exhaust gases, such as carbon monoxide, hydrocarbons, and nitrogen oxides, into harmless substances such as carbon dioxide, water, and nitrogen.

[0003] The particulate filter in the exhaust system is used to filter particulate matter. However, as captured particles accumulate, they clog the filter pores, leading to increased exhaust back pressure and directly affecting the engine's intake efficiency. A differential pressure sensor assesses the particulate matter buildup inside the filter by measuring the pressure difference between the inlet and outlet of the particulate filter. When the pressure difference continues to rise and reaches a preset threshold, regeneration is deemed necessary, requiring the particulate filter to be regenerated and cleaned.

[0004] The differential pressure sensor and the particulate filter are connected via a differential pressure pipeline. Specifically, the inlet and outlet of the particulate filter are connected to the differential pressure sensor via these pipelines. The differential pressure pipeline consists of a rubber hose and a rigid metal tube. Assembly requires overcoming the friction between the two; the end of the rigid metal tube is inserted into the rubber hose and then secured with a clamp. Fixation is primarily achieved through the deformation of the rubber hose and the friction between the rigid metal tube. This design makes assembly time-consuming and labor-intensive. Under conditions of sudden vehicle stops or bumpy roads, the rigid metal tube is prone to detachment due to pulling, potentially leading to vehicle malfunction. Utility Model Content

[0005] The purpose of this application is to provide a pipe connection structure assembly, which aims to solve the problem that the differential pressure pipeline between the differential pressure sensor and the particle trap is time-consuming and labor-intensive to assemble, and is prone to metal rigid pipe detachment during vehicle operation.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a pipe fitting connection structure assembly, including: The first pipe fitting is a flexible pipe fitting; The second pipe fitting is a rigid pipe fitting, and the mating end of the second pipe fitting has a pipe fitting limiting step; The first clamp is fixedly connected to the mating end of the first pipe fitting; The second clamp is radially spliced ​​with the first clamp along the first pipe fitting, and the mating side of the first clamp and / or the mating side of the second clamp are provided with clamp limiting steps; In the spliced ​​state, the first clamp and the second clamp cooperate to restrict the displacement of the second pipe fitting in the radial direction of the first pipe fitting, and the clamp limiting step contacts the pipe fitting limiting step to restrict the displacement of the second pipe fitting away from the first pipe fitting in the axial direction of the first pipe fitting.

[0007] In traditional differential pressure piping assembly, static friction exists between the inner wall of the rubber hose and the outer wall of the metal rigid pipe head. This static friction is determined by the elastic deformation (clamping force) of the rubber hose and the coefficient of friction between the rubber hose and the metal rigid pipe head. During assembly, workers need to force a larger diameter head into the smaller inner diameter rubber hose. Although this creates an initial interference fit and clamping force, this clamping force depends entirely on the elasticity of the rubber material. The elasticity of the rubber material is easily affected, leading to a decrease in clamping force or the friction being overcome, resulting in insufficient connection reliability.

[0008] Meanwhile, there is an abrupt step between the metal tube body and the upsetting head. When pulled (especially under axial tension), this step becomes a stress concentration point and a potential detachment guide surface. Since friction is the main force resisting axial tension, it exacerbates the risk of the rubber hose slipping along the step surface.

[0009] When a vehicle comes to an abrupt stop, the entire differential pressure piping system generates a forward inertial force, which is converted into an axial tensile force acting on the interface between the rubber hose and the metal rigid pipe. If this tensile force exceeds the maximum static friction between the rubber hose and the metal rigid pipe, the connection will begin to slip. The relative movement between the engine (connecting the metal rigid pipe) and the vehicle body / chassis (connecting the rubber hose) during bumpy rides causes repeated, undirected stretching and compression at the connection point, gradually compressing it and gradually weakening its tightness. If the direction of the stretching is not perfectly parallel to the axial direction, it can also generate a bending moment, causing localized deformation of the rubber hose opening and reducing the gripping force on one side, making it easier for the connection to detach from that point.

[0010] Although a clamp is installed at the connection point between the rubber hose and the metal rigid pipe, it mainly provides radial clamping force and cannot effectively resist axial pull-out force. If the initial assembly position is poor or the pulling force is too large, the clamp and the rubber hose will be pushed off the upsetting head together.

[0011] Moreover, relying on workers to force the parts in makes it difficult to precisely uniform the tightness and insertion depth of the assembly. If it is too loose, it is easy to come out, while if it is too tight, it may damage the rubber or cause excessive stress during assembly.

[0012] The solution shown in this application embodiment, compared with the prior art, involves a first clamp pre-installed on the mating end of the first pipe fitting. During installation, the mating end of the second pipe fitting is first roughly aligned with the mating end of the first pipe fitting, and the two are brought close together. Subsequently, the second clamp is gradually moved closer to the first clamp along the radial direction of the first pipe fitting until it is spliced ​​with the first clamp. As the second clamp moves closer to the first clamp, it pushes the second pipe fitting to gradually align with the first pipe fitting. After splicing, the first and second clamps enclose the second pipe fitting, restricting its displacement radially. Simultaneously, the clamp's limiting step contacts and limits the pipe fitting's limiting step, thereby restricting the second pipe fitting's displacement away from the first pipe fitting axially, preventing the second pipe fitting from detaching from the enclosed space of the first and second clamps.

[0013] The pipe fitting connection structure assembly of this application has the following beneficial effects: Firstly, the rigid encasing ring formed by the engagement of the first and second clamps provides a rigid radial restraint on the second pipe fitting, preventing it from swaying, becoming eccentric, or loosening. Compared to radial restraint achieved solely by rubber clamping force, the radial restraint method of this application is more reliable.

[0014] Secondly, the cooperation between the clamp limiting step and the fitting limiting step forms an axial mechanical stop. When the second fitting is subjected to an axial tensile force that moves it away from the first fitting, the fitting limiting step will abut against the clamp limiting step. The force is directly transmitted and dispersed through the rigid structure of the first and second clamps, no longer relying solely on the friction between rubber and metal, effectively avoiding the risk of the second fitting being pulled out.

[0015] Thirdly, during assembly, the second pipe fitting only needs to be roughly aligned with the first pipe fitting and brought close together, eliminating the need to resist friction during assembly. Simultaneously, the radial engagement of the second clamp onto the first clamp is simple, achieving alignment of the two pipe fittings at the same time. This makes the assembly process more controllable and less strenuous, reducing the demands on worker strength and skill. Furthermore, once the second clamp is properly engaged, the clamp's limiting step and the pipe fitting's limiting step automatically reach the designed mating position, ensuring consistent axial limiting depth in each assembly and stable quality.

[0016] In summary, this application utilizes the cooperation of the first and second clamps to simultaneously achieve rigid radial and axial positioning of the second pipe fitting. Mechanical interlocking is used to lock the first and second pipe fittings, effectively improving connection reliability and mitigating the risk of the second pipe fitting being pulled out during vehicle operation. Furthermore, the assembly process of the first and second pipe fittings has been optimized, evolving from laborious insertion to aligned snap-fit ​​connection, saving time and effort and ensuring good assembly consistency.

[0017] In conjunction with the first aspect, in one possible implementation, one of the first clamp and the second clamp is provided with a buckle, and the other of the first clamp and the second clamp is provided with a locking hole, wherein the buckle and the locking hole are fitted together radially along the first pipe fitting.

[0018] In the above technical solution, the assembly worker only needs to align the buckle on the second clamp with the locking hole on the first clamp and press radially. A "click" sound indicates that the assembly is complete. The entire process requires no auxiliary tools and can be operated with one hand, simplifying the assembly process, shortening assembly time, and meeting the high-paced requirements of automotive assembly lines. Furthermore, it eliminates problems such as loose connections or over-tightening caused by human error, resulting in extremely high consistency in assembly quality.

[0019] In some embodiments, an extension is integrally connected to one side of the first pipe fitting's mating end, and the first clamp is embedded in the extension.

[0020] In the above technical solution, the extension forms a locally reinforced area at the mating end of the first pipe fitting, reducing deformation of the first pipe fitting body and improving the overall rigidity of the connection. Using the extension to wrap and position the first clamp effectively prevents the first clamp from rotating or moving axially relative to the first pipe fitting, ensuring reliable contact between the clamp's limiting step and the pipe fitting's limiting step. Furthermore, during operation, the extension can more evenly distribute the clamping force to the first pipe fitting, reducing localized stress concentration and thus lowering the risk of damage or seal failure due to compression of the first pipe fitting.

[0021] In some embodiments, the buckle is disposed on the mating surface of the second clamp, the locking hole is disposed on the mating surface of the first clamp, the locking hole also has a through port located on the outer peripheral surface of the first clamp, the buckle passes through the locking hole and contacts and engages with the edge of the through port; The extension is provided with a clearance notch corresponding to the protrusion port.

[0022] In the above technical solution, the buckle and the locking hole are respectively set on the mating surface of the second clamp and the first clamp, avoiding the occupation of the external space of the first clamp and the second clamp in the radial direction of the first pipe fitting, which helps to improve the structural compactness. Furthermore, non-destructive disassembly can be achieved by pressing the part of the buckle that protrudes, facilitating system maintenance, repair, or pipe fitting replacement.

[0023] In conjunction with the first aspect, in one possible implementation, the mating side of the first clamp is provided with a U-shaped limiting collar, the closed side of which can contact the outer peripheral surface of the second clamp and keep the second clamp in a clearance state away from the first clamp, so that the second pipe fitting can enter the operating space between the first clamp and the second clamp along the axial direction of the first pipe fitting.

[0024] In the above technical solution, the assembler does not need to use their hands or tools to support the second clamp, so they can hold the second pipe fitting stably with one hand and insert it into place, which simplifies the operation process and is especially suitable for scenarios in confined spaces or where rapid operation is required.

[0025] In some embodiments, a plurality of limiting collars are provided at intervals along the axial direction of the first pipe fitting.

[0026] In the above technical solution, multiple limiting collars are set at intervals along the axial direction, providing several reliable constraint points for the second clamp, so that it is firmly locked in the avoidance position, eliminating unnecessary shaking and ensuring that the operating space is always completely open.

[0027] In some embodiments, the outer peripheral surface of the second clamp is provided with a positioning groove. In the avoidance state, the closed side of the limiting collar is placed in the positioning groove to limit the displacement of the second clamp in the axial direction of the first pipe.

[0028] In the above technical solution, by adding the positioning groove, the closed side of the limiting collar is embedded in the positioning groove, forming a mechanical interlock, which restricts the displacement of the second clamp in the axial direction of the first pipe fitting. This improves the positional stability of the second clamp in the avoidance state, preventing it from sliding axially due to gravity, vibration, or accidental contact.

[0029] In conjunction with the first aspect, in one possible implementation, the mating end of the second pipe fitting is provided with a tapered boss. In the direction away from the mating end face of the first pipe fitting, the outer diameter of the tapered boss gradually increases, and the large end of the tapered boss forms the pipe fitting limiting step. Both the mating sides of the first clamp and the second clamp are provided with clamp limiting steps. Both the first clamp and the second clamp have clearance grooves on their mating sidewalls that correspond to the limiting step of the pipe fitting.

[0030] In the above technical solution, even if there is a slight radial deviation in the initial position when the second pipe is inserted, the conical surface of the conical boss can automatically guide the second pipe to slide into the operating space, which helps to reduce the assembly difficulty and the requirements for operating accuracy, and is suitable for blind assembly or space-constrained scenarios.

[0031] Secondly, embodiments of this application also provide an exhaust system, including the above-described pipe connection structure assembly.

[0032] Compared with the prior art, the solution shown in this application, by adopting the above-mentioned pipe connection structure assembly and using mechanical interlocking to lock the first and second pipes, effectively improves the connection reliability and avoids the risk of the second pipe being pulled out during driving, thus improving the reliability of the exhaust system. Furthermore, the good assembly consistency between the first and second pipes contributes to improving the consistency of the exhaust system's quality.

[0033] Thirdly, embodiments of this application also provide a vehicle including the exhaust system described above.

[0034] Compared with the prior art, the solution shown in this application, by adopting the above-mentioned exhaust system, ensures the stability and reliability of the vehicle's exhaust function, reduces the failure rate of the exhaust system, and helps to reduce the maintenance cost of the whole vehicle. Attached Figure Description

[0035] 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.

[0036] Figure 1 Schematic diagram of the assembly process of the pipe fitting connection structure assembly provided in the embodiments of this application Figure 1 ; Figure 2 Schematic diagram of the assembly process of the pipe fitting connection structure assembly provided in the embodiments of this application Figure 2 ; Figure 3 An exploded view of the pipe fitting connection structure assembly provided in the embodiments of this application; Figure 4 This is a schematic diagram of the assembly of the first clamp and the limiting collar used in the embodiments of this application; Figure 5 This is a schematic diagram of the assembly of the second clamp and buckle used in the embodiments of this application; Figure 6 A schematic diagram of the usage state of the pipe fitting connection structure assembly provided in the embodiments of this application; Figure 7 In order to be in Figure 6 In this embodiment, the internal structure cross-sectional view of the pipe fitting connection structure assembly provided in this application is shown.

[0037] In the figure: 1. First pipe fitting; 2. Second pipe fitting; 3. First clamp; 4. Second clamp; 410. Positioning groove; 5. Pipe fitting limiting step; 6. Clamp limiting step; 7. Buckle; 8. Clip hole; 810. Through port; 9. Extension; 910. Receiving groove; 920. Positioning boss; 930. Avoidance notch; 10. Platform notch; 11. Limiting collar; 12. Avoidance groove; 110. First receiving groove; 210. Second receiving groove. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In traditional differential pressure piping assembly, static friction exists between the inner wall of the rubber hose and the outer wall of the metal rigid pipe head. This static friction is determined by the elastic deformation (clamping force) of the rubber hose and the coefficient of friction between the rubber hose and the metal rigid pipe head. During assembly, workers need to force a larger diameter head into the smaller inner diameter rubber hose. Although this creates an initial interference fit and clamping force, this clamping force depends entirely on the elasticity of the rubber material. The elasticity of the rubber material is easily affected, leading to a decrease in clamping force or the friction being overcome, resulting in insufficient connection reliability.

[0042] Meanwhile, there is an abrupt step between the metal tube body and the upsetting head. When pulled (especially under axial tension), this step becomes a stress concentration point and a potential detachment guide surface. Since friction is the main force resisting axial tension, it exacerbates the risk of the rubber hose slipping along the step surface.

[0043] When a vehicle comes to an abrupt stop, the entire differential pressure piping system generates a forward inertial force, which is converted into an axial tensile force acting on the interface between the rubber hose and the metal rigid pipe. If this tensile force exceeds the maximum static friction between the rubber hose and the metal rigid pipe, the connection will begin to slip. The relative movement between the engine (connecting the metal rigid pipe) and the vehicle body / chassis (connecting the rubber hose) during bumpy rides causes repeated, undirected stretching and compression at the connection point, gradually compressing it and gradually weakening its tightness. If the direction of the stretching is not perfectly parallel to the axial direction, it can also generate a bending moment, causing localized deformation of the rubber hose opening and reducing the gripping force on one side, making it easier for the connection to detach from that point.

[0044] Although a clamp is installed at the connection point between the rubber hose and the metal rigid pipe, it mainly provides radial clamping force and cannot effectively resist axial pull-out force. If the initial assembly position is poor or the pulling force is too large, the clamp and the rubber hose will be pushed off the upsetting head together.

[0045] Moreover, relying on workers to force the parts in makes it difficult to precisely uniform the tightness and insertion depth of the assembly. If it is too loose, it is easy to come out, while if it is too tight, it may damage the rubber or cause excessive stress during assembly.

[0046] To resolve the above issues, please refer to the following: Figures 1 to 7 The pipe fitting connection structure assembly provided in this application will now be described. The pipe fitting connection structure assembly includes a first pipe fitting 1, a second pipe fitting 2, a first clamp 3, and a second clamp 4. The first pipe fitting 1 is a flexible pipe fitting, and the second pipe fitting 2 is a rigid pipe fitting. A fitting limiting step 5 is formed at the mating end of the second pipe fitting 2. The first clamp 3 is fixedly connected to the mating end of the first pipe fitting 1, and the second clamp 4 is radially engaged with the first clamp 3. A clamp limiting step 6 is provided on the mating side of the first clamp 3 and / or the mating side of the second clamp 4. Both the first clamp 3 and the second clamp 4 are rigid components, and their materials can be metal (e.g., stainless steel, aluminum alloy) or engineering plastics (e.g., reinforced nylon, polyphenylene sulfide).

[0047] In the snap-fit ​​state, the first clamp 3 and the second clamp 4 cooperate to restrict the displacement of the second pipe fitting 2 in the radial direction of the first pipe fitting 1, and the clamp limiting step 6 contacts the pipe fitting limiting step 5 to restrict the displacement of the second pipe fitting 2 away from the first pipe fitting 1 in the axial direction of the first pipe fitting 1.

[0048] In this embodiment, the mating side of the first clamp 3 and the second clamp 4 refers to the side of the first clamp 3 facing the second clamp 4 after they are snapped together, and the side of the second clamp 4 facing the first clamp 3.

[0049] In this embodiment, the distribution of the clamp limiting steps 6 is illustrated as follows: The clamp limiting steps 6 are provided on the mating side of the first clamp 3, but not on the mating side of the second clamp 4; or, the clamp limiting steps 6 are provided on the mating side of the second clamp 4, but not on the mating side of the first clamp 3; or, clamp limiting steps 6 are provided on both the mating sides of the first clamp 3 and the second clamp 4. Preferably, the clamp limiting steps 6 correspond to the fitting limiting steps 5, that is, the fitting limiting steps 5 and clamp limiting steps 6 are in one-to-one correspondence in quantity, and the step surface area of ​​the fitting limiting steps 5 is equal to the step surface area of ​​the clamp limiting steps 6.

[0050] In this embodiment, the first pipe fitting 1 can be implemented in ways including but not limited to rubber pipe fittings, and the second pipe fitting 2 can be implemented in ways including but not limited to stainless steel pipe fittings.

[0051] Compared with the prior art, the pipe fitting connection structure assembly provided in this application has a first clamp 3 pre-installed on the mating end of the first pipe fitting 1. During installation, the mating end of the second pipe fitting 2 is first roughly aligned with the mating end of the first pipe fitting 1, and the two are brought close to each other. Then, the second clamp 4 is gradually moved closer to the first clamp 3 along the radial direction of the first pipe fitting 1 until it is spliced ​​with the first clamp 3. As the second clamp 4 moves closer to the first clamp 3, the second clamp 4 pushes the second pipe fitting 2 to gradually align with the first pipe fitting 1. After splicing, the first clamp 3 and the second clamp 4 wrap around the second pipe fitting 2, restricting the displacement of the second pipe fitting 2 in the radial direction of the first pipe fitting 1. At the same time, the clamp limiting step 6 contacts and limits the pipe fitting limiting step 5, thereby restricting the displacement of the second pipe fitting 2 away from the first pipe fitting 1 in the axial direction of the first pipe fitting 1, and preventing the second pipe fitting 2 from coming out of the wrapping of the first clamp 3 and the second clamp 4.

[0052] The pipe fitting connection structure assembly of this application has the following beneficial effects: Firstly, the rigid covering ring formed by the engagement of the first clamp 3 and the second clamp 4 provides a rigid constraint on the second pipe fitting 2 in the radial direction, preventing the second pipe fitting 2 from shaking, becoming eccentric, or loosening. Compared to radial limiting solely relying on rubber clamping force, the radial limiting method of this application is more reliable.

[0053] Secondly, the engagement of the clamp limiting step 6 and the fitting limiting step 5 forms an axial mechanical stop. When the second fitting 2 is subjected to an axial tensile force that moves it away from the first fitting 1, the fitting limiting step 5 will abut against the clamp limiting step 6. The force is directly transmitted and dispersed through the rigid structure of the first clamp 3 and the second clamp 4, no longer relying solely on the friction between rubber and metal, effectively avoiding the risk of the second fitting 2 being pulled out.

[0054] Thirdly, during assembly, the second pipe fitting 2 only needs to be roughly aligned with the first pipe fitting 1 and brought close together, eliminating the need to resist friction during assembly. Simultaneously, the radial engagement of the second clamp 4 onto the first clamp 3 is simple, achieving alignment of the two pipe fittings at the same time. This makes the assembly process more controllable and less strenuous, reducing the demands on worker strength and skill. Furthermore, once the second clamp 4 is properly engaged, the clamp limiting step 6 and the pipe fitting limiting step 5 will automatically reach their designed mating positions, ensuring consistent axial limiting depth and stable quality in each assembly.

[0055] In summary, this application utilizes the cooperation of the first clamp 3 and the second clamp 4 to simultaneously achieve rigid radial and axial limiting of the second pipe fitting 2. Mechanical interlocking is used to lock the first pipe fitting 1 and the second pipe fitting 2, effectively improving connection reliability and mitigating the risk of the second pipe fitting 2 being pulled out during vehicle operation. Furthermore, the assembly process of the first pipe fitting 1 and the second pipe fitting 2 is optimized, evolving from laborious insertion to aligned snap-fit ​​connection, saving time and effort in the assembly process and ensuring good assembly consistency.

[0056] In some embodiments, the specific layout of the fitting limiting step 5 and the clamp limiting step 6 is illustrated below: 1) A first protruding structure is provided on the outer periphery of the mating end of the second pipe fitting 2. The end of the first protruding structure away from the mating end of the second pipe fitting 2 forms a pipe fitting limiting step 5. The first clamp 3 and / or the second clamp 4 are provided with a first recessed structure corresponding to the first protruding structure. The side of the first recessed structure away from the first pipe fitting 1 forms a clamp limiting step 6. After assembly, the first protruding structure is placed in the first recessed structure.

[0057] 2) A second recessed structure is provided on the outer periphery of the mating end of the second pipe fitting 2, forming a pipe fitting limiting step 5 on the side away from the mating end of the second pipe fitting 2. The first clamp 3 and / or the second clamp 4 are provided with a second protruding structure corresponding to the second recessed structure, and the side of the second protruding structure away from the first pipe fitting 1 forms a clamp limiting step 6. After assembly, the second protruding structure is placed in the second recessed structure.

[0058] For specific implementation, please refer to Figures 3 to 5To accommodate the second pipe fitting 2, the side wall of the first clamp 3 has a first receiving groove 110 corresponding to the inner cavity of the first pipe fitting 1, and the side wall of the second clamp 4 has a second receiving groove 210 corresponding to the first receiving groove 110. When the second clamp 4 and the first clamp 3 are engaged, the first receiving groove 110 and the second receiving groove 210 are aligned to form a receiving channel for accommodating the second pipe fitting 2. At least one of the first receiving groove 110 and the second receiving groove 210 is provided with a clamp limiting step 6. When the second clamp 4 and the first clamp 3 are engaged, the clamp limiting step 6 contacts the pipe fitting limiting step 5.

[0059] In some embodiments, see Figures 1 to 6 One of the first clamp 3 and the second clamp 4 is provided with a buckle 7, and the other of the first clamp 3 and the second clamp 4 is provided with a locking hole 8. The buckle 7 and the locking hole 8 are fitted together radially along the first pipe fitting 1.

[0060] This embodiment uses a snap-fit ​​method to connect the first clamp 3 and the second clamp 4. The assembly worker only needs to align the buckle 7 on the second clamp 4 with the locking hole 8 on the first clamp 3 and press radially. A "click" sound indicates that the assembly is in place. The entire process requires no auxiliary tools and can be operated with one hand, simplifying the assembly process, shortening the assembly time, and making it suitable for the high-speed requirements of automobile assembly lines.

[0061] Meanwhile, the "click" sound or feel is a clear positive feedback signal, eliminating subjective errors caused by relying on experience to judge whether the assembly is in place. As long as the clip 7 is engaged with the locking hole 8, it means that the connection has reached the correct position and locking state as designed, eliminating problems such as loose connection or overtightening caused by human negligence, and ensuring extremely high consistency in assembly quality.

[0062] In addition, when it is necessary to inspect the pipeline or replace parts, the second clamp 4 can usually be removed from the first clamp 3 without damage by pressing the tongue of the clip 7 with a special tool, avoiding destructive disassembly, improving the maintainability of the system, and enabling the reuse of parts.

[0063] Optionally, in order to make the snap-fit ​​assembly between the first clamp 3 and the second clamp 4 more uniform in terms of force, the buckle 7 is provided in two sets, and the two sets of buckles 7 are symmetrically arranged on opposite sides of the second clamp 4. The buckle hole 8 is provided in two sets, and the two sets of buckle holes 8 are symmetrically arranged on opposite sides of the first clamp 3. The buckle 7 and the buckle hole 8 correspond one-to-one.

[0064] Other examples of ways to achieve the splicing of the first clamp 3 and the second clamp 4 are as follows: 1) The first clamp 3 has a first connecting ear protruding from both sides, and the second clamp 4 has a second connecting ear protruding from both sides. The first connecting ear and the second connecting ear are provided in a one-to-one correspondence, and the first connecting ear and the second connecting ear are connected and fixed by threaded fasteners.

[0065] 2) The first clamp 3 has a first connecting ear protruding from both sides, and the second clamp 4 has a second connecting ear protruding from both sides. The first connecting ear and the second connecting ear are provided in a one-to-one correspondence. The first connecting ear has a connecting through hole, and the second connecting ear has a snap-fit ​​through hole. The first connecting ear and the second connecting ear are connected and fixed by a straight-insertion buckle that passes through the connecting through hole and the snap-fit ​​through hole in sequence.

[0066] In some embodiments, see Figures 1 to 3 , Figure 6 and Figure 7 An extension 9 is integrally connected to one side of the mating end of the first pipe fitting 1. The extension 9 and the first pipe fitting 1 enclose a platform notch 10. A first clamp 3 is embedded in the extension 9, with the mating side of the first clamp 3 exposed in the platform notch 10. The extension 9 is made of the same material as the first pipe fitting 1, and the extension 9 and the first pipe fitting 1 are integrally formed by injection molding. Alternatively, the first clamp 3 can be integrally fitted with the extension 9 through a secondary injection molding process, or the first clamp 3 can be bonded and fixed to the extension 9.

[0067] By providing the extension 9, this embodiment can achieve the following beneficial effects: Firstly, the joint end of the first pipe fitting 1 has low strength and is prone to deformation when directly mated with the first clamp 3. The extension 9 forms a local reinforced area at the joint end of the first pipe fitting 1, allowing the first clamp 3 to be securely embedded therein. This reduces the deformation of the first pipe fitting 1 body when subjected to axial tension or radial pressure, thereby improving the rigidity of the overall connection.

[0068] Secondly, the first clamp 3 is embedded in the extension 9. The extension 9 wraps and positions the first clamp 3, which can effectively prevent the first clamp 3 from rotating or moving axially relative to the first pipe fitting 1. This ensures that the mating side of the first clamp 3 and the second clamp 4 always maintains precise alignment, thereby ensuring reliable contact between the clamp limiting step 6 and the pipe fitting limiting step 5.

[0069] Third, the first clamp 3 is connected to the first pipe fitting 1 through the extension 9, which increases the contact area and connection strength between the first clamp 3 and the first pipe fitting 1. During operation, the extension 9 can more evenly transmit the clamping force to the first pipe fitting 1, reducing local stress concentration and thus reducing the risk of damage or seal failure of the first pipe fitting 1 due to compression.

[0070] Optionally, the extension 9 has an arc-shaped cross-section, with its outer circular surface flush with the outer circumferential surface of the first pipe fitting 1. The end face of the extension 9 adjacent to the inner cavity of the first pipe fitting 1 is parallel to the major axis of the first pipe fitting 1. Taking the end face of the extension 9 adjacent to the inner cavity of the first pipe fitting 1 as a reference end face, and aligning the reference end face with the corresponding radial line of the first pipe fitting 1, the radial dimension of the extension 9 is the same as the radius of the first pipe fitting 1. Alternatively, the reference end face is a certain distance from the corresponding radial line of the first pipe fitting 1, in which case the radial dimension of the extension 9 is smaller than the radius of the first pipe fitting 1.

[0071] In some specific embodiments, see Figure 3 The extension 9 has a receiving groove 910 on the side facing the inner cavity of the first pipe fitting 1, and a positioning boss 920 at the end of the receiving groove 910 away from the first pipe fitting 1. The positioning boss 920 can restrict the displacement of the first clamp 3 in the axial direction of the first pipe fitting 1. The receiving groove 910 can achieve circumferential or radial constraint of the first clamp 3, while the positioning boss 920 provides an axial stop, so that the first clamp 3 can be quickly and accurately pushed to the predetermined position during installation, and can effectively resist axial displacement caused by pressure or vibration from inside the first pipe fitting 1 in the working state, ensuring the stability of the position of the first clamp 3.

[0072] In some embodiments, see Figures 1 to 6 The buckle 7 is located on the mating surface of the second clamp 4, and the locking hole 8 is located on the mating surface of the first clamp 3. The locking hole 8 also has a through port 810 located on the outer peripheral surface of the first clamp 3. The buckle 7 passes through the locking hole 8 and contacts and engages with the edge of the through port 810. The extension 9 is provided with a clearance notch 930 corresponding to the through port 810.

[0073] In this embodiment, the buckle 7 and the locking hole 8 are respectively located on the mating surfaces of the second clamp 4 and the first clamp 3, avoiding the occupation of the external space of the first clamp 3 and the second clamp 4 in the radial direction of the first pipe fitting 1, which helps to improve the structural compactness. At the same time, the buckle 7 extends from the through port 810, and its position and status can be directly observed from the outer peripheral surface of the first clamp 3, providing a visual basis for rapid quality inspection without the need for disassembly or instrument detection. In addition, if the buckle 7 is designed to be releasable (such as with a press-to-unlock tongue), it can be disassembled without damage by pressing the part of the buckle 7 that protrudes, which facilitates the maintenance, repair or replacement of the pipe fitting.

[0074] In some embodiments, see Figures 1 to 4 , Figure 6 and Figure 7The first clamp 3 has a U-shaped limiting collar 11 on its mating side. The closed side of the limiting collar 11 can contact the outer peripheral surface of the second clamp 4, keeping the second clamp 4 in a clearance state away from the first clamp 3, so that the second pipe fitting 2 can enter the operating space between the first clamp 3 and the second clamp 4 along the axial direction of the first pipe fitting 1. In this embodiment, the limiting collar 11 is integrally formed with the first clamp 3 by injection molding.

[0075] In the avoidance state, the mating surface of the first clamp 3 is directly opposite the mating surface of the second clamp 4, with a certain distance between them. This ensures that the diameter of the space between the wall of the first receiving groove 110 and the wall of the second receiving groove 210 is slightly larger than the outer diameter of the pipe fitting limiting step 5. The second clamp 4 will not fall off the limiting collar 11, but it allows the second pipe fitting 2 to be inserted into the space between the first receiving groove 110 and the second receiving groove 210 along the axial direction of the first pipe fitting 1. At the factory, the first pipe fitting 1, the first clamp 3, and the second clamp 4 are assembled as a whole for easy transport. Because a large operating space is formed between the first clamp 3 and the second clamp 4, during installation, the mating end of the second pipe fitting 2 is first inserted into this operating space. After the mating end face of the second pipe fitting 2 is basically in contact with the mating end face of the first pipe fitting 1, the second clamp 4 is pushed radially along the first pipe fitting 1, causing the second clamp 4 to engage with the first clamp 3. The assembly of the first pipe fitting 1 and the second pipe fitting 2 is then complete.

[0076] The assembler does not need to use their hands or tools to support the second clamp 4, so they can hold the second pipe fitting 2 stably with one hand and insert it into place, which simplifies the operation process and is especially suitable for scenarios in confined spaces or where rapid operation is required.

[0077] As the second clamp 4 gradually approaches the first clamp 3, the second clamp 4 gradually disengages from the limiting collar 11 until it is completely separated from the limiting collar 11, presenting the following appearance. Figure 6 and Figure 7 As shown in the diagram. Alternatively, the second clamp 4 is always connected to the limiting collar 11. In this case, the limiting collar 11 needs to have a certain degree of flexibility so that it can bend as the second clamp 4 moves.

[0078] In some embodiments, see Figures 1 to 4 , Figure 6 and Figure 7 On the axial direction of the first pipe fitting 1, there are several limiting collars 11 spaced apart.

[0079] A single limiting collar 11 can only constrain a small section of the second clamp 4. When subjected to accidental contact or gravity, the second clamp 4 may still rotate or swing. By setting multiple limiting collars 11 spaced apart along the axial direction, several reliable constraint points are provided for the second clamp 4, ensuring that it is firmly locked in the avoidance position, eliminating unnecessary shaking, and ensuring that the operating space is always completely open.

[0080] Furthermore, for applications with larger pipe diameters or requiring higher connection rigidity, the length (axial dimension) of the second clamp 4 may need to be increased accordingly. A single limiting collar 11 is insufficient to stably restrain a long clamp. Multiple collars spaced axially apart can better match the geometry of a long clamp, providing uniform and sufficient support along its entire length.

[0081] In some embodiments, see Figure 3 , Figure 5 , Figure 6 and Figure 7 The outer circumferential surface of the second clamp 4 is provided with a positioning groove 410. In the avoidance state, the closed side of the limiting collar 11 is placed in the positioning groove 410 to restrict the displacement of the second clamp 4 in the axial direction of the first pipe fitting 1. As the second clamp 4 gradually approaches the first clamp 3, the limiting collar 11 gradually disengages from the positioning groove 410.

[0082] The limiting collar 11 mainly provides radial constraint. After adding the positioning groove 410, the closed side of the limiting collar 11 is embedded in the positioning groove 410, forming a mechanical interlock, which restricts the displacement of the second clamp 4 in the axial direction of the first pipe fitting 1. This improves the positional stability of the second clamp 4 in the avoidance state, and it will not slide axially due to gravity, vibration or accidental contact.

[0083] Optionally, in order to improve the bonding strength between the limiting collar 11 and the positioning groove 410, the limiting collar 11 and the positioning groove 410 are interference-fitted. Without external force, the limiting collar 11 will not come out of the positioning groove 410, thereby ensuring that the second clamp 4 always remains in an effective bond with the limiting collar 11.

[0084] In some embodiments, see Figures 3 to 5 and Figure 7 The second pipe fitting 2 has a tapered boss (i.e., the aforementioned first protrusion structure) at its mating end. The outer diameter of the tapered boss gradually increases in the direction away from the mating end face of the first pipe fitting 1. The larger end of the tapered boss forms a pipe fitting limiting step 5. Both the first clamp 3 and the second clamp 4 have clamp limiting steps 6 on their mating sides. The mating sidewalls of the first clamp 3 and the second clamp 4 each have a relief groove 12 (i.e., the aforementioned first recess structure) corresponding to the pipe fitting limiting step 5, providing accommodating space for the larger end of the tapered boss on the second pipe fitting 2 when the first clamp 3 and the second clamp 4 are joined and closed.

[0085] When the second fitting 2 is inserted, even if there is a slight radial deviation in the initial position, the conical surface of the tapered boss can automatically guide the second fitting 2 to slide into the operating space, which helps to reduce the assembly difficulty and the requirements for operating accuracy, and is suitable for blind assembly or space-constrained scenarios.

[0086] In some embodiments, after assembly, the adaptation relationship between the second pipe fitting 2 and the first pipe fitting 1 is exemplified as follows: 1) The outer diameter of the small end of the tapered boss is smaller than the inner diameter of the pipe opening of the first pipe fitting 1, the small end of the tapered boss extends into the inner cavity of the first pipe fitting 1, and the outer peripheral surface of the tapered boss tightly abuts against the edge of the pipe opening of the first pipe fitting 1, thereby achieving a seal; 2) The outer diameter of the small end of the tapered boss is larger than the inner diameter of the pipe opening of the first pipe fitting 1, the end face of the small end of the tapered boss abuts against the mating end face of the first pipe fitting 1, thereby achieving a seal.

[0087] Optionally, a sealing gasket may be provided between the first pipe fitting 1 and the tapered boss to further improve the reliability of the seal. For example, a sealing gasket may be embedded on the mating end face of the first pipe fitting 1, and the sealing gasket may be in close contact with the small end face of the tapered boss.

[0088] Based on the same inventive concept, this application also provides an exhaust system, including the above-mentioned pipe connection structure assembly.

[0089] Compared with the prior art, the exhaust system provided in this application, by adopting the above-mentioned pipe connection structure assembly and using mechanical interlocking to lock the first pipe 1 and the second pipe 2, effectively improves the connection reliability and effectively avoids the risk of the second pipe 2 being pulled out during driving, thus improving the reliability of the exhaust system. Furthermore, the assembly consistency between the first pipe 1 and the second pipe 2 is good, which helps to improve the consistency of the exhaust system's quality.

[0090] Based on the same inventive concept, this application also provides a vehicle including the exhaust system described above.

[0091] Compared with the prior art, the vehicle provided in this application, by adopting the above-mentioned exhaust system, ensures the stability and reliability of the vehicle's exhaust function, reduces the failure rate of the exhaust system, and helps to reduce the maintenance cost of the whole vehicle.

[0092] 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 fitting connection structure assembly, characterized in that, include: The first fitting (1) is a flexible fitting; The second pipe fitting (2) is a rigid pipe fitting, and the mating end of the second pipe fitting (2) is formed with a pipe fitting limiting step (5); The first clamp (3) is fixedly connected to the mating end of the first pipe fitting (1); The second clamp (4) is radially spliced ​​with the first clamp (3) along the first pipe fitting (1), and the mating side of the first clamp (3) and / or the mating side of the second clamp (4) are provided with clamp limiting steps (6). In the spliced ​​state, the first clamp (3) cooperates with the second clamp (4) to restrict the displacement of the second pipe fitting (2) in the radial direction of the first pipe fitting (1), and the clamp limiting step (6) contacts the pipe fitting limiting step (5) to restrict the displacement of the second pipe fitting (2) away from the first pipe fitting (1) in the axial direction of the first pipe fitting (1).

2. The pipe fitting connection structure assembly as described in claim 1, characterized in that, One of the first clamp (3) and the second clamp (4) is provided with a buckle (7), and the other of the first clamp (3) and the second clamp (4) is provided with a locking hole (8). The buckle (7) and the locking hole (8) are fitted together radially along the first pipe fitting (1).

3. The pipe fitting connection structure assembly as described in claim 2, characterized in that, The first pipe fitting (1) has an extension (9) integrally connected to one side of the docking end, and the first clamp (3) is embedded in the extension (9).

4. The pipe fitting connection structure assembly as described in claim 3, characterized in that, The buckle (7) is provided on the mating surface of the second clamp (4), the buckle hole (8) is provided on the mating surface of the first clamp (3), the buckle hole (8) also has a through port (810) located on the outer peripheral surface of the first clamp (3), the buckle (7) passes through the buckle hole (8) and contacts and engages with the edge of the through port (810); The extension (9) is provided with a clearance notch (930) corresponding to the through port (810).

5. The pipe fitting connection structure assembly as described in claim 1, characterized in that, The first clamp (3) has a U-shaped limiting collar (11) on its mating side. The closed side of the limiting collar (11) can contact the outer peripheral surface of the second clamp (4) and keep the second clamp (4) away from the first clamp (3) so that the second pipe fitting (2) can enter the operating space between the first clamp (3) and the second clamp (4) along the axial direction of the first pipe fitting (1).

6. The pipe fitting connection structure assembly as described in claim 5, characterized in that, Along the axial direction of the first pipe fitting (1), there are several limiting collars (11) spaced apart.

7. The pipe fitting connection structure assembly as described in claim 5, characterized in that, The outer circumferential surface of the second clamp (4) is provided with a positioning groove (410). In the avoidance state, the closed side of the limiting collar (11) is placed in the positioning groove (410) to restrict the displacement of the second clamp (4) in the axial direction of the first pipe (1).

8. The pipe fitting connection structure assembly as described in claim 1, characterized in that, The second pipe fitting (2) has a tapered boss at the docking end. In the direction away from the docking end face of the first pipe fitting (1), the outer diameter of the tapered boss gradually increases. The large end of the tapered boss forms the pipe fitting limiting step (5). The docking sides of the first clamp (3) and the second clamp (4) are both provided with clamp limiting steps (6). The first clamp (3) and the second clamp (4) both have a relief groove (12) corresponding to the pipe fitting limiting step (5) on their mating sidewalls.

9. An exhaust system, characterized in that, Includes the pipe connection structure assembly as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the exhaust system as described in claim 9.

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