A differential pressure hose structure, exhaust system and vehicle

Abstract

The application provides a differential pressure hose structure, an exhaust system and a vehicle, and belongs to the technical field of automobile exhaust systems. The differential pressure hose structure is divided into at least two sections of split hoses, and the adjacent two sections of split hoses are connected through a connecting pipe, so that the angle of each section of split hose can be flexibly adjusted to adapt to installation deviation, and meanwhile, the adjacent two sections of split hoses are kept in communication through the insertion of the connecting pipe and the inner cavity of the split hose, so that the smooth flow of air is ensured. Through the rotating cooperation of the annular boss and the annular groove, it is ensured that the phenomenon of jamming and deviation does not easily occur during rotation adjustment; an axial limiting structure is formed, which can effectively prevent the axial movement of the connecting pipe and the split hose in vehicle vibration, thereby ensuring the reliability of the pipeline connection; meanwhile, the close fit of the annular groove and the annular boss ensures the sealing property of the air pressure passage.

Description

Technical Field

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

[0002] Currently, as the automotive industry continues to raise its requirements for the filtration and control of particulate matter in exhaust gases, the gas particulate filter (GPF), as a core component for particulate matter capture, has been widely applied in the exhaust systems of gasoline-powered vehicles. To ensure that the GPF maintains its efficient particulate matter capture capability, it is necessary to monitor the degree of particulate matter accumulation inside it in real time. This monitoring process requires a differential pressure sensor.

[0003] In existing technologies, differential pressure sensors and particulate filters are typically connected by differential pressure hoses. Besides connecting the air pressure pathways between the two, the hoses also serve to isolate vibrations. In practical applications, due to space constraints in the overall layout of the vehicle chassis and exhaust system, the differential pressure hoses must be designed with a specific orientation based on the spatial location of surrounding components to complete the connection within a limited space.

[0004] However, due to manufacturing errors in components and assembly tolerances in the vehicle, the actual installation positions at both ends of the differential pressure hose cannot perfectly match the design specifications. To complete the assembly, operators often need to apply external force to forcibly assemble the hose, which directly results in the hose being twisted after assembly and creating localized stress concentrations. With prolonged use, the differential pressure hose is prone to cracking and leaking, affecting not only the filtration efficiency of the particulate filter but also potentially causing vehicle malfunctions, reducing the vehicle's reliability and lifespan. Utility Model Content

[0005] The purpose of this application is to provide a differential pressure hose structure, an exhaust system, and a vehicle, in order to solve the technical problem in the prior art where the differential pressure hose is twisted after assembly due to installation deviations, which easily leads to cracking and leakage of the differential pressure hose.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: Firstly, a differential pressure hose structure is provided, comprising: At least two separate flexible hoses, connected end to end; and At least one connecting tube is provided, the two ends of which are respectively inserted into the inner cavities of two adjacent sections of the split hose, thereby enabling the two adjacent sections of the split hose to communicate with each other. At least one end of the connecting tube is provided with a rotating part, which is rotatably engaged with the corresponding split hose so that the split hose can rotate around the central axis of the connecting tube.

[0007] In practical applications, due to the limited space of the vehicle chassis and exhaust system, differential pressure hoses are usually designed as bends with specific orientations based on the spatial location of surrounding components to ensure they can complete the connection within a confined space. However, during component manufacturing and vehicle assembly, manufacturing and assembly tolerances are unavoidable, causing the actual installation positions of the differential pressure hose's ends to not perfectly match the design during assembly. To complete the assembly, operators often apply external force to forcibly assemble the hose, directly resulting in a twisted state after assembly. Over time, this can easily lead to cracking and leakage in the differential pressure hose.

[0008] The beneficial effects of the differential pressure hose structure provided in this application are as follows: Compared with the prior art, the differential pressure hose structure of this application, by dividing the differential pressure hose structure into at least two separate hose segments and connecting adjacent two separate hose segments with a connecting pipe, allows the differential pressure hose structure to flexibly adjust the angle of each separate hose segment to adapt to installation deviations. Simultaneously, by inserting the connecting pipe into the inner cavity of the separate hose segments, the adjacent two separate hose segments remain interconnected, ensuring unobstructed airflow. Specifically, the rotating part of the connecting pipe allows the connected separate hose segments to rotate freely around the central axis of the connecting pipe, enabling each separate hose segment to independently adjust its installation angle. When installation position deviations occur, angle compensation can be achieved through rotation. After assembly, each separate hose segment is in a natural, untwisted state, without localized stress concentration areas, significantly reducing the risk of cracking and leakage in the differential pressure hose structure, ensuring the structural stability of the differential pressure pipeline, thereby guaranteeing the efficient filtration capability of the particulate filter and improving the overall reliability of the vehicle.

[0009] In conjunction with the first aspect, in one possible implementation, the rotating part is an annular boss located on the outer periphery of the end of the connecting pipe, and an annular groove is provided on the inner circumferential wall of the split hose. The annular boss is inserted into the annular groove and can fit tightly with the annular groove, and the annular boss and the annular groove are rotatably engaged.

[0010] The annular boss and the annular groove are in full circumferential contact, with a large contact area and uniform force distribution, making it less prone to jamming or displacement during rotation and adjustment. Moreover, they can form a clear limiting structure, which can effectively prevent the connecting pipe and the split hose from axial movement during vehicle vibration, ensuring the reliability of the pipeline connection. At the same time, the tight fit between the annular groove and the annular boss ensures the air pressure passage is sealed.

[0011] In some embodiments, the distance between the side wall of the annular groove near the docking end of the split hose and the docking end face of the split hose is 8mm-12mm.

[0012] The aforementioned distance limit not only prevents the annular groove from being too close to the mating end face, which could cause the interference sealing surface to fail due to deformation of the mating end or loosen the fit with the connecting pipe, thus improving the reliability of the interference seal; it also prevents the annular groove from being too far away from the mating end, which would increase the resistance during assembly with the connecting pipe and ensure ease of installation.

[0013] In some embodiments, the outer peripheral wall of the annular boss and the shaft end face are transitioned by a first tapered surface, with the small-diameter end of the first tapered surface facing the shaft end face of the annular boss; The annular groove is connected to the inner wall of the split hose by a second conical surface, which is in close contact with the first conical surface.

[0014] The first conical surface reduces assembly resistance, making the insertion process smoother and more efficient, and effectively reducing operational difficulty. The tapers of the first and second conical surfaces match to form a guide slope, which guides the annular boss to gradually engage with the annular groove, preventing jamming.

[0015] In some embodiments, the small-diameter end of the first tapered surface is smaller than the inner diameter of the split flexible tube.

[0016] By making the diameter of the small-diameter end smaller than the inner diameter of the split hose, the initial insertion resistance can be significantly reduced, further improving the smoothness and efficiency of assembly.

[0017] In some embodiments, a coating layer is provided on the outer peripheral wall of the annular boss and the first conical surface, and the coating layer contacts the annular groove and the second conical surface respectively to seal the gap between the connecting pipe and the split hose.

[0018] The coating can fill the tiny gaps between the annular boss and the annular groove, as well as between the first conical surface and the second conical surface, enhancing the sealing of the air pressure passage. The lubricating properties of the coating can also significantly reduce the frictional resistance when assembling the connecting pipe and the split hose, improving the ease of assembly. The coating can also reduce the rotational frictional resistance between the annular boss and the annular groove during rotational adjustment, making the rotational adjustment operation smoother and helping to extend the overall service life.

[0019] In conjunction with the first aspect, in one possible implementation, the two mating end faces of two adjacent sections of the split hose are tightly fitted together.

[0020] By tightly fitting the mating ends of the two separate hoses, a secondary seal is formed, further improving the air pressure passage's sealing performance, effectively blocking tiny air leakage channels, and ensuring the accuracy of differential pressure detection.

[0021] Secondly, this application also provides an exhaust system, including a particulate filter, a differential pressure sensor, and the aforementioned differential pressure hose structure. The particulate filter and the differential pressure sensor are respectively connected to the vehicle body. The differential pressure hose structure has two sets, which are respectively connected between the intake end of the differential pressure sensor and the particulate filter and between the outlet end of the differential pressure sensor and the particulate filter.

[0022] The exhaust system provided in this application embodiment, due to including the aforementioned differential pressure hose structure, has all the beneficial effects of the aforementioned differential pressure hose structure. It enables the differential pressure hose structure to flexibly adjust the angle of each segment of the split hose to adapt to installation deviations. After assembly, each segment of the split hose can be in a natural, untwisted state, significantly reducing the risk of cracking and leakage of the differential pressure hose structure, ensuring the structural stability of the differential pressure pipeline, guaranteeing the efficient filtration capability of the particulate filter, and improving the overall reliability of the vehicle.

[0023] In conjunction with the second aspect, in one possible implementation, the inlet and outlet of the particulate trap are respectively connected to differential pressure hard tubes, and the two differential pressure hard tubes extend towards the end of the particulate trap closer to the differential pressure sensor; the two sets of differential pressure flexible tube structures are connected to the two differential pressure hard tubes in a one-to-one correspondence.

[0024] The rigid differential pressure line can withstand the high temperatures of the exhaust system, preventing the differential pressure hose structure from directly contacting high-temperature components and affecting its service life, thus ensuring the stability of air pressure transmission. The combination of the rigid differential pressure line and the flexible differential pressure hose structure not only adapts to the complex spatial layout of the car chassis, but also improves the vibration and impact resistance of the differential pressure line, significantly enhancing the overall reliability of the exhaust system.

[0025] Thirdly, embodiments of this application also provide a vehicle including the aforementioned exhaust system.

[0026] The vehicle provided in this application embodiment includes the aforementioned exhaust system and therefore has all the beneficial effects of the aforementioned exhaust system, which will not be repeated here. Attached Figure Description

[0027] 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.

[0028] Figure 1 This is a schematic diagram of an exhaust system provided in an embodiment of this application; Figure 2This is a schematic diagram of a differential pressure hose structure provided in an embodiment of this application; Figure 3 Examples of this application Figure 2 Schematic diagram of the cross-sectional structure along line AA; Figure 4 This is a partial cross-sectional view of the split-type flexible tube provided in an embodiment of this application; Figure 5 This is a cross-sectional view of the connecting pipe provided in an embodiment of this application.

[0029] In the picture: 1. Split flexible hose; 11. Annular groove; 12. Second conical surface; 2. Connecting pipe; 21. Annular boss; 22. First conical surface; 3. Clamp; 10. Particle trap; 101. Inlet end; 102. Outlet end; 103. Pipe support; 20. Differential pressure sensor; 30. Differential pressure rigid pipe. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] For ease of description, the inner and outer directions defined in the embodiments of this application are based on the radial direction of the split hose. That is, "inner" refers to the side of the split hose closer to its axis in the radial direction, and "outer" refers to the side of the split hose away from its axis in the radial direction.

[0034] With the full implementation of the National VI emission standards for motor vehicles, the requirements for filtration and control of exhaust pollutants from gasoline-powered vehicles have significantly increased. To meet the stringent limits on particulate matter emissions in these standards, particulate filters have been widely applied to the exhaust systems of gasoline-powered vehicles. The core function of a particulate filter is to capture particulate matter in exhaust gases and reduce pollutant emissions; therefore, particulate filters have become a key component of the exhaust systems of gasoline-powered vehicles.

[0035] To ensure the particulate filter operates efficiently at all times, a differential pressure sensor is used to monitor the level of particulate matter buildup inside in real time. This allows for triggering regeneration (i.e., removing the accumulated particulate matter through high-temperature combustion) when the buildup reaches a threshold. The differential pressure sensor indirectly determines the amount of particulate matter buildup inside the particulate filter by detecting the pressure difference between the intake and exhaust ends. This pressure difference data is then fed back to the engine control unit (ECU) in real time. The ECU then uses this pressure difference data to precisely determine whether the particulate filter needs to initiate regeneration.

[0036] In existing technologies, differential pressure sensors and particulate filters are typically connected using a differential pressure hose (usually a rubber tube). Besides connecting the air pressure pathways between the two, the hose also utilizes the elastic deformation capacity of its rubber material to isolate vibrations, ensuring the overall stability of the differential pressure connection. In practical applications, due to space constraints in the overall layout of the vehicle chassis and exhaust system, differential pressure hoses usually need to be designed with a specific bend in the direction of the surrounding components to ensure that the connection can be completed within a limited space.

[0037] However, the inventors discovered that during the production of parts and the assembly of the whole vehicle, manufacturing tolerances (such as deviations in the length and port size of differential pressure hoses) and assembly tolerances (such as deviations in the installation positions of particulate traps and differential pressure sensors) are unavoidable. This causes the actual installation positions of the two ends of the differential pressure hose to not be able to match the design state perfectly during actual assembly.

[0038] In this situation, operators often apply external force to the differential pressure hose to force it into place, directly causing the hose to be twisted after assembly. This creates localized stress concentration inside the hose, which accumulates further due to engine vibration and road bumps during vehicle operation. After prolonged use, the rubber material in the stress concentration area is prone to fatigue aging, leading to cracking and air leakage in the differential pressure hose. This causes deviations in the differential pressure value detected by the differential pressure sensor, affecting the engine control system's judgment on regeneration treatment. This not only affects the filtration efficiency of the particulate filter but may also cause abnormal engine operation, excessive exhaust pollutants, and in severe cases, even vehicle malfunction.

[0039] To resolve the above issues, please refer to the following: Figures 1 to 5 This application describes a differential pressure hose structure, an exhaust system, and a vehicle. The differential pressure hose structure includes at least two separate hose sections 1 and at least one connecting pipe 2. The at least two separate hose sections 1 are connected end-to-end. Both ends of the connecting pipe 2 are inserted into the inner cavities of two adjacent separate hose sections 1, enabling communication between them. At least one end of the connecting pipe 2 is provided with a rotating portion, which rotatably engages with the corresponding separate hose section 1, allowing the separate hose section 1 to rotate around the central axis of the connecting pipe 2.

[0040] This application provides a differential pressure hose structure that, compared to existing technologies, divides the differential pressure hose structure into at least two separate hose segments 1, connecting adjacent segments 1 via a connecting pipe 2. This allows for flexible adjustment of the angles of each segment 1 to accommodate installation deviations. Simultaneously, the connecting pipe 2, inserted into the inner cavity of each segment 1, maintains interconnectivity between adjacent segments, ensuring unobstructed airflow. Specifically, the rotating part of the connecting pipe 2 allows the connected segment 1 to rotate freely around its central axis, enabling independent adjustment of the installation angle of each segment 1. When installation position deviations occur, angle compensation can be achieved through rotation. After assembly, each segment 1 is in a natural, untwisted state, without localized stress concentration areas, significantly reducing the risk of cracking and leakage in the differential pressure hose structure. This ensures the structural stability of the differential pressure pipeline, thereby guaranteeing the high-efficiency filtration capability of the particulate filter 10 and improving the overall reliability of the vehicle.

[0041] Furthermore, it is understandable that existing technologies require the separate development of dedicated differential pressure hoses for different chassis space layouts and different installation angle requirements. However, in this embodiment, the combination structure of the split hose 1 and the connecting pipe 2, utilizing the angle adjustment capability of the rotating part, can flexibly adapt to different installation position deviations and different spatial layout differences. That is, the same differential pressure hose structure combining the split hose 1 and the connecting pipe 2 can meet the connection requirements of various scenarios simply by adjusting the rotation angle of each segment of the split hose 1, significantly reducing the types of components to be developed and effectively saving development costs.

[0042] Furthermore, the split structure of this embodiment, combined with the adjustability of the rotating part, reduces the accuracy requirements for the installation position. During the assembly process, the angle of each section of the split hose 1 can be flexibly adjusted without repeated alignment calibration, which significantly simplifies the assembly operation and improves the overall vehicle assembly efficiency.

[0043] It should be noted that each segment of the separate hose 1 can have a different fixed direction. Multiple separate hoses 1 are connected end-to-end to form a differential pressure hose structure that can adapt to the spatial layout of the vehicle's exhaust system. In other words, the separate hose 1 is not a highly flexible pipe that can be bent at will, but rather a functional component that combines moderate rigidity (hardness of 60HB-75HB) with a pre-set specific direction. For example, the separate hose 1 can be made of reinforced rubber hose, which improves the pipe's resistance to bending deformation without affecting its vibration absorption function, preventing changes in airflow resistance caused by pipe collapse or excessive deformation, and ensuring the accuracy of the data detected by the differential pressure sensor 20.

[0044] Overall, the moderate stiffness of the split hose 1 ensures structural stability and air pressure detection accuracy, and its specific orientation adapts to spatial layout and functional requirements. The rotation design of the split hose 1 and the connecting pipe 2 solves the problem of hose twisting caused by installation deviation without compromising the above core characteristics, thus taking into account both the orientation fixity and installation flexibility of the differential pressure hose structure.

[0045] Specifically, taking two separate flexible hoses 1 as an example, the two hoses 1 are connected by a connecting tube 2. The connecting tube 2 is a hollow tubular structure, which can be made of plastic. To ensure the stability of the rotational fit, the connecting tube 2 needs to have high hardness, at least greater than that of the hoses 1. The inner cavities of the two hoses 1 and the hollow inner cavity of the connecting tube 2 are sequentially connected to form a connection passage for gas flow. One end of the connecting tube 2 is fixedly connected to one of the hoses 1, and the other end is provided with a rotating part. The rotating part can be a ball head structure or a truncated ring structure located at the end of the connecting tube 2, and a sealing ring is embedded in the ball head structure or the truncated ring structure. Correspondingly, a connector can be provided at the end of the other hose 1. The connector has a spherical groove or annular groove that matches the rotating part. Optionally, the groove structure can also be directly set on the inner wall of the hose 1. By inserting the rotating part into the hose 1, the rotational sealing fit between the hose 1 and the connecting tube 2 is achieved.

[0046] Optionally, both ends of the connecting tube 2 are provided with rotating parts, and the two separate hose segments 1 are respectively rotatably engaged with the two rotating parts. That is to say, the two separate hose segments 1 can rotate around the central axis of the connecting tube 2 to achieve angle adjustment. In the scenario where three or more separate hose segments 1 are connected, each pair of adjacent separate hose segments 1 is connected by the connecting tube 2 in this embodiment, which can increase the convenience of angle adjustment operation of each segment.

[0047] In addition, it should be noted that the differential pressure hose structure provided in this embodiment can also be applied to other scenarios with the same installation requirements besides the vehicle exhaust system. That is to say, in other application scenarios, by dividing the whole hose with a specific direction into multiple split hoses 1 and using the connecting pipe 2 to make the adjacent two split hoses 1 achieve a rotational sealing fit, all of these fall within the protection scope of this application.

[0048] In some embodiments, the rotating part described above may be as follows: Figure 3 , Figure 4 and Figure 5 The structure shown. Please refer to [link / reference]. Figure 3 , Figure 4 and Figure 5 The rotating part is an annular boss 21 located on the outer periphery of the end of the connecting pipe 2. An annular groove 11 is provided on the inner wall of the split hose 1. The annular boss 21 is inserted into the annular groove 11 and can fit tightly with the annular groove 11. The annular boss 21 and the annular groove 11 rotate in cooperation.

[0049] In this embodiment, the outer peripheral wall of the annular boss 21 and the inner peripheral groove wall of the annular groove 11 are in smooth contact, without any obstructing or limiting structure, allowing the split hose 1 to rotate freely in the circumferential direction around the central axis of the connecting pipe 2. After the annular boss 21 is inserted into the annular groove 11, the two end faces of the annular boss 21 abut against the axial groove sidewall of the annular groove 11, forming an axial limit, which can effectively prevent the connecting pipe 2 and the split hose 1 from falling off and separating.

[0050] The rubber material of the split hose 1 has moderate elasticity. After the annular groove 11 and the annular boss 21 are tightly fitted together, an interference fit is formed. Dynamic sealing can be achieved through the elastic deformation of the split hose 1 material to prevent air pressure leakage. Furthermore, an annular sealing groove can be opened on the outer peripheral wall of the annular boss 21, and an O-ring can be embedded therein. The O-ring tightly abuts against the inner peripheral groove wall of the annular groove 11 to form a double seal.

[0051] In the above structure, the annular boss 21 and the annular groove 11 are in full circumferential contact, with a large contact area and uniform force distribution, making it less prone to jamming or displacement during rotation and adjustment; moreover, it can form a clear axial limiting structure, which can effectively prevent the connecting pipe 2 and the split hose 1 from axial movement during vehicle vibration, ensuring the reliability of the pipeline connection; at the same time, the tight fit between the annular groove 11 and the annular boss 21 ensures the sealing of the air pressure passage.

[0052] In addition, the annular boss 21 can be integrally formed with the connecting pipe 2, and the annular groove 11 can be integrally formed with the split hose 1. Through the cooperation of the annular boss 21 and the annular groove 11, the integrated design of the rotating structure and the sealing structure is realized, which simplifies the processing technology and saves mold development costs.

[0053] For some specific embodiments, please refer to Figure 4 The distance L between the side wall of the annular groove 11 near the docking end of the split hose 1 and the docking end face of the split hose 1 is 8mm-12mm. For example, the distance L can be 9mm, 10mm, or 11mm, and preferably 10mm.

[0054] The 8mm-12mm distance ensures that the annular groove 11 is located in a reasonable stress area within the inner cavity of the split hose 1. This avoids the annular groove 11 being too close to the mating end face, which could cause the interference seal surface to be affected by the deformation of the mating end, resulting in sealing failure or loosening of the fit with the connecting pipe 2, thus improving the reliability of the interference seal. It also avoids the annular groove 11 being too far away from the mating end, which would increase the resistance during assembly with the connecting pipe 2, ensuring ease of installation.

[0055] In some embodiments, see Figure 3 , Figure 4 and Figure 5 The outer peripheral wall of the annular boss 21 is connected to the shaft end face through a first conical surface 22, with the small diameter end of the first conical surface 22 facing the shaft end face of the annular boss 21; the side wall of the annular groove 11 away from the docking end of the split hose 1 is connected to the inner peripheral wall of the split hose 1 through a second conical surface 12, with the second conical surface 12 and the first conical surface 22 closely fitting together.

[0056] The inclined structure of the first conical surface 22 can disperse the force when the connecting tube 2 is inserted into the split flexible tube 1, reduce assembly resistance, make the insertion process smoother and more efficient, and effectively reduce the difficulty of operation.

[0057] The first conical surface 22 and the second conical surface 12 have matching tapers to form a guide slope. When the connecting tube 2 is inserted into the inner cavity of the split hose 1, the first conical surface 22 will slide smoothly along the slope of the second conical surface 12, thereby guiding the annular boss 21 to gradually fit into the annular groove 11, avoiding jamming. At the same time, the mutual cooperation of the conical surfaces can also automatically correct the coaxiality of the connecting tube 2 and the split hose 1, reducing repeated adjustments during assembly and improving assembly efficiency.

[0058] For some specific embodiments, please refer to Figure 3 The small diameter end of the first conical surface 22 is smaller than the inner diameter of the split hose 1.

[0059] The smaller diameter end of the first tapered surface 22 can be inserted more easily into the port of the split hose 1, and then smoothly embedded into the annular groove 11 with the help of the first tapered surface 22. In addition, the diameter of the smaller diameter end is smaller than the inner diameter of the split hose 1, which can significantly reduce the initial insertion resistance and further improve the smoothness and efficiency of assembly.

[0060] For example, the small diameter end of the first conical surface 22 can be equal to the inner diameter of the connecting tube 2, and the difference between it and the inner diameter of the split hose 1 can be limited to 2mm-3mm. On the one hand, it is necessary to ensure the above-mentioned ease of assembly, and on the other hand, it is necessary to ensure that the inner diameter of the connecting tube 2 is not too small than the inner diameter of the split hose 1, so as not to increase the resistance to gas flow in the inner cavity.

[0061] In some embodiments, a coating layer (not shown in the figure) is provided on the outer peripheral wall of the annular boss 21 and the first conical surface 22. The coating layer contacts the annular groove 11 and the second conical surface 12 respectively to seal the gap between the connecting pipe 2 and the split hose 1.

[0062] In this embodiment, before the connecting tube 2 is inserted into the split hose 1, lubricating silicone grease is applied to the outer peripheral wall of the annular boss 21 and the first conical surface 22 to form a uniform coating layer. This coating layer can fill the tiny gaps between the annular boss 21 and the annular groove 11, as well as between the first conical surface 22 and the second conical surface 12 (the unevenness of the mating surfaces may cause the existence of tiny gaps). On the basis of interference seal, an additional sealing layer is formed, which significantly enhances the sealing performance of the air pressure passage and ensures the accuracy of differential pressure detection.

[0063] In addition, the lubricating properties of the coating can significantly reduce the frictional resistance when assembling the connecting pipe 2 and the split hose 1. Combined with the guiding effect of the first conical surface 22, it can further improve the ease of assembly. At the same time, the coating can also reduce the rotational frictional resistance between the annular boss 21 and the annular groove 11 during rotational adjustment, making the rotational adjustment operation smoother and reducing structural damage caused by friction, which helps to extend the overall service life.

[0064] It should be understood that the coating uses a non-corrosive lubricating silicone grease, which can avoid damaging the rubber material of the split hose 1, prevent material aging and cracking, and further ensure structural stability and reliability.

[0065] In some embodiments, see Figure 3 The two mating ends of the two adjacent sections of the split hose 1 are tightly fitted together.

[0066] In this embodiment, the connecting tube 2 is a straight tube component that is integrally embedded in the inner cavity of two adjacent split hose sections 1. Both ends of the connecting tube 2 are integrally formed with annular bosses 21 and first conical surfaces 22. The inner cavities of the two adjacent split hose sections 1 are provided with corresponding annular grooves 11 and second conical surfaces 12. During assembly, the two ends of the connecting tube 2 are respectively inserted into the inner cavities of the two split hose sections 1, so that the annular bosses 21 are engaged in the corresponding annular grooves 11. At the same time, the mating end faces of the two split hose sections 1 are completely fitted together.

[0067] By rotating the two ends of the connecting pipe 2 with the corresponding split hose 1, both sections of the split hose 1 can be rotated independently around the central axis of the connecting pipe 2, making the angle adjustment more flexible and more accurately adaptable to complex installation deviations and spatial layouts.

[0068] By tightly fitting the mating ends of the two separate hoses 1, a secondary seal is formed, which further improves the sealing performance of the air pressure passage, effectively blocks tiny air leakage channels, and ensures the accuracy of differential pressure detection. At the same time, the mating ends can further restrict the axial movement of the separate hoses 1, which helps to enhance the overall connection stability.

[0069] Based on the same inventive concept, please refer to Figure 1 This application embodiment also provides an exhaust system, including a particulate filter 10, a differential pressure sensor 20, and the aforementioned differential pressure hose structure. The particulate filter 10 and the differential pressure sensor 20 are respectively connected to the vehicle body. The differential pressure hose structure is provided in two sets, and is respectively connected between the differential pressure sensor 20 and the air intake end 101 of the particulate filter 10 and between the differential pressure sensor 20 and the air outlet end 102 of the particulate filter 10.

[0070] In this embodiment, the particulate filter 10 is connected to the exhaust pipe and fixedly connected to the vehicle body through the exhaust pipe. The differential pressure sensor 20 is also fixedly installed at a preset position on the vehicle body. After the particulate filter 10 and the differential pressure sensor 20 are fixedly installed, the inlet end 101 and outlet end 102 of the particulate filter 10 are connected to the differential pressure sensor 20 through two sets of differential pressure hose structures, so as to realize the transmission of differential pressure signal between the inlet end 101 and the outlet end 102.

[0071] The exhaust system provided in this application embodiment, due to including the aforementioned differential pressure hose structure, has all the beneficial effects of the aforementioned differential pressure hose structure. It enables the differential pressure hose structure to flexibly adjust the angle of each segment of the split hose 1 to adapt to installation deviations. After assembly, each segment of the split hose 1 can be in a natural, untwisted state, significantly reducing the risk of cracking and leakage of the differential pressure hose structure, ensuring the structural stability of the differential pressure pipeline, guaranteeing the high-efficiency filtration capability of the particulate filter 10, and improving the overall reliability of the vehicle.

[0072] In some embodiments, see Figure 1 The inlet end 101 and outlet end 102 of the particulate trap 10 are respectively connected to differential pressure hard tubes 30, and the two differential pressure hard tubes 30 extend towards the end of the particulate trap 10 near the differential pressure sensor 20; two sets of differential pressure hose structures are connected to the two differential pressure hard tubes 30 one by one.

[0073] The differential pressure rigid pipe 30 is typically made of metal, which can withstand the high temperatures of the exhaust system and prevents the differential pressure hose structure from directly contacting high-temperature components, thus affecting the service life of the differential pressure hose structure and ensuring the stability of air pressure transmission. The combination of the differential pressure rigid pipe 30 and the differential pressure hose structure not only adapts to the complex spatial layout of the car chassis, but also improves the vibration and impact resistance of the differential pressure pipeline, significantly enhancing the overall reliability of the exhaust system.

[0074] Specifically, two differential pressure rigid pipes 30 are connected to the outer wall of the particulate filter 10 via pipe fittings, and are respectively connected to the air inlet 101 and air outlet 102 of the particulate filter 10. A pipe support 103 is also connected to the outer wall of the particulate filter 10 to fix and support the two differential pressure rigid pipes 30, ensuring the positional stability of the differential pressure rigid pipes 30 and thus increasing the connection stability between the differential pressure rigid pipes 30 and the differential pressure hose structure. The differential pressure rigid pipes 30 and the differential pressure hose structure, as well as the differential pressure hose structure and the differential pressure sensor 20, are connected by clamps 3 to increase connection reliability.

[0075] Based on the same inventive concept, embodiments of this application also provide a vehicle including the aforementioned exhaust system.

[0076] The vehicle provided in this application embodiment includes the aforementioned exhaust system and therefore has all the beneficial effects of the aforementioned exhaust system, which will not be repeated here.

[0077] 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 differential pressure hose structure, characterized in that, include: At least two separate flexible tubes (1) are connected end to end; as well as At least one connecting tube (2) is provided, the two ends of which are respectively inserted into the inner cavities of two adjacent sections of the split hose (1) and the two adjacent sections of the split hose (1) are connected to each other. At least one end of the connecting tube (2) is provided with a rotating part, which is rotatably engaged with the corresponding split hose (1) so that the split hose (1) can rotate around the central axis of the connecting tube (2).

2. The differential pressure hose structure as described in claim 1, characterized in that, The rotating part is an annular boss (21) located on the outer periphery of the end of the connecting pipe (2). The inner wall of the split hose (1) is provided with an annular groove (11). The annular boss (21) is inserted into the annular groove (11) and can fit tightly with the annular groove (11). The annular boss (21) and the annular groove (11) rotate together.

3. The differential pressure hose structure as described in claim 2, characterized in that, The distance between the side wall of the annular groove (11) near the docking end of the split hose (1) and the docking end face of the split hose (1) is 8mm-12mm.

4. The differential pressure hose structure as described in claim 2, characterized in that, The outer peripheral wall of the annular boss (21) and the shaft end face are connected by a first tapered surface (22), and the small diameter end of the first tapered surface (22) faces the shaft end face of the annular boss (21). The annular groove (11) is separated from the docking end of the split hose (1) by a second conical surface (12) through which the inner cavity peripheral wall of the split hose (1) is connected. The second conical surface (12) is in close contact with the first conical surface (22).

5. The differential pressure hose structure as described in claim 4, characterized in that, The small diameter end of the first conical surface (22) is smaller than the inner diameter of the split hose (1).

6. The differential pressure hose structure as described in claim 5, characterized in that, The outer peripheral wall of the annular boss (21) and the first conical surface (22) are both provided with a coating layer. The coating layer contacts the annular groove (11) and the second conical surface (12) respectively to seal the gap between the connecting pipe (2) and the split hose (1).

7. The differential pressure hose structure as described in any one of claims 1-6, characterized in that, The two mating ends of the two adjacent sections of the split hose (1) are tightly fitted together.

8. An exhaust system, characterized in that, The device includes a particulate filter (10), a differential pressure sensor (20), and a differential pressure hose structure as described in any one of claims 1-7. The particulate filter (10) and the differential pressure sensor (20) are respectively connected to the vehicle body. The differential pressure hose structure is provided in two sets, which are respectively connected between the air inlet (101) of the differential pressure sensor (20) and the air outlet (102) of the particulate filter (10).

9. The exhaust system as described in claim 8, characterized in that, The inlet (101) and outlet (102) of the particulate trap (10) are respectively connected to differential pressure hard tubes (30), and the two differential pressure hard tubes (30) extend towards the end of the particulate trap (10) near the differential pressure sensor (20); the two sets of differential pressure hose structures are connected one-to-one with the two differential pressure hard tubes (30).

10. A vehicle, characterized in that, Includes the exhaust system as described in claim 8 or 9.

Images