Intake and exhaust communication pipe, engine system, and vehicle

Abstract

This invention discloses an intake and exhaust connecting pipe, an engine system, and a vehicle, relating to the field of vehicle technology. The intake and exhaust connecting pipe connects the turbocharger intake port and multiple cylinder exhaust ports, comprising multiple pipe sections and multiple flexible components. Each pipe section includes a coaxially arranged sub-exhaust channel and a sub-insulation channel, with the sub-insulation channel covering the exterior of the sub-exhaust channel. Adjacent pipe sections are connected by flexible components, each including a coaxially arranged first connecting channel and a second connecting channel. The first connecting channel connects to adjacent sub-exhaust channels, and the second connecting channel covers the exterior of the first connecting channel. Each pipe section connects to at least one cylinder exhaust port, and the multiple pipe sections are connected in series via the flexible components to form an exhaust channel, which is connected to the turbocharger intake port through a manifold. This intake and exhaust connecting pipe not only improves energy utilization but also enhances the reliability and durability of the engine system.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to an intake and exhaust connecting pipe, an engine system, and a vehicle. Background Technology

[0002] Modern vehicle engines widely employ turbocharging technology to improve power and efficiency. Turbochargers, especially turbochargers, have become a core component of the engine's intake system. Their working principle involves using the energy of the exhaust gases to drive a turbine, which in turn drives a coaxial compressor to compress the intake air, increasing the air density entering the cylinders. This allows for the injection of more fuel, significantly enhancing the engine's power output.

[0003] In typical turbocharged engine systems, the high-temperature exhaust gases produced by fuel combustion in each cylinder are collected by the exhaust manifold. This exhaust manifold is connected to the turbine inlet of the turbocharger, used to concentrate the exhaust gases from each cylinder and guide them into the turbine to drive it to perform work. However, the exhaust gas temperature is extremely high during this process, reaching 800°C or even higher, causing a sharp rise in the exhaust manifold wall temperature. The intense heat radiation from the exhaust manifold can cause thermal damage to other surrounding engine components, such as sensor wiring harnesses, oil lines, and vacuum tubes, affecting their service life and reliability, and posing safety hazards. To address this problem, existing technologies typically use a heat shield to insulate the exhaust manifold, reducing heat radiation and protecting surrounding components.

[0004] However, after the exhaust manifold is insulated, the internal heat will cause thermal deformation of the exhaust manifold, which will generate huge thermal stress at the connection points, seriously affecting the reliability and durability of the engine. Summary of the Invention

[0005] The purpose of this invention is to provide an intake and exhaust connection pipe, an engine system, and a vehicle. This intake and exhaust connection pipe can provide heat insulation and heat preservation while absorbing thermal deformation caused by high-temperature exhaust gas, eliminating stress concentration problems, and thereby improving the reliability and durability of the engine system.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] An intake and exhaust manifold for connecting the intake port of a turbocharger and the exhaust ports of multiple cylinders, comprising:

[0008] The pipeline consists of multiple sections, each including a sub-exhaust channel and a sub-insulation channel arranged coaxially, wherein the sub-insulation channel covers the outside of the sub-exhaust channel;

[0009] Multiple flexible components are provided, and adjacent pipelines are connected through the flexible components. Each flexible component includes a first connecting channel and a second connecting channel arranged coaxially. The first connecting channel connects to the adjacent sub-exhaust channel, and the second connecting channel covers the outside of the first connecting channel.

[0010] Each pipe segment is connected to at least one of the cylinder exhaust ports, and multiple pipe segments are connected in series via the flexible component to form an exhaust channel. The exhaust channel is connected to the turbocharger intake port through a manifold.

[0011] As an optional embodiment of the intake and exhaust connecting pipe, the minimum radial width of the second connecting channel is maintained at 1mm to 3mm.

[0012] As an optional embodiment of the inlet and outlet connecting pipe, the flexible component includes an inner flexible member and a first outer flexible member that are sleeved and connected, and the pipeline includes an inner pipe and an outer pipe;

[0013] The two ends of the inner flexible component are respectively connected to adjacent inner tubes to connect adjacent sub-exhaust channels; the two ends of the first outer flexible component are respectively connected to adjacent outer tubes to connect adjacent sub-insulation channels.

[0014] As an optional embodiment of the intake and exhaust connecting pipe, the inner flexible component is an inner corrugated pipe, and the first outer flexible component is a first outer corrugated pipe;

[0015] The two ends of the inner corrugated pipe are respectively welded to the adjacent inner pipe, and the two ends of the first outer corrugated pipe are respectively welded to the adjacent outer pipe.

[0016] As an optional embodiment of the intake and exhaust connecting pipe, the gap between the maximum outer diameter D1 of the inner corrugated pipe and the minimum inner diameter D2 of the first outer corrugated pipe is 1mm to 3mm; and the maximum length L1 of the corrugated section of the inner corrugated pipe is less than the distance L2 between the end faces of two adjacent outer pipes.

[0017] As an optional embodiment of the intake and exhaust connecting pipe, the inner pipe end is provided with an inner connecting boss, and the inner corrugated pipe is welded to the inner connecting boss;

[0018] The outer tube end is provided with an external connecting boss, and the first outer corrugated tube is welded to the external connecting boss;

[0019] The height of the inner connecting boss is less than the radial width of the sub-insulation channel.

[0020] As an optional embodiment of the inlet and outlet connecting pipe, the flexible component further includes a transition flange and a second outer flexible member, wherein the transition flange connects two adjacent pipe sections and blocks the sub-insulation channel of one of the pipe sections; the second outer flexible member is connected to the transition flange and the other pipe section.

[0021] As an alternative to the inlet and outlet connecting pipe, in two adjacent pipe sections, the inner and outer pipes of one pipe section are both connected to one end of the transition flange, and the transition flange blocks its sub-insulation channel; the two ends of the sub-insulation channel of the other pipe section are closed and connected to the other end of the transition flange.

[0022] As an optional solution for the inlet and outlet connecting pipe, the second outer flexible component is a second outer corrugated pipe, one end of which is connected to the transition flange, and the other end is connected to the pipe closed by the sub-insulation channel.

[0023] As an alternative to the inlet and outlet connecting pipe, the multi-segment pipeline includes multiple branch pipes and a manifold. The branch pipes are connected to each other through the inner flexible member and the first outer flexible member, and the manifold is connected to the adjacent branch pipes through the transition flange and the second outer flexible member.

[0024] As an optional solution for the intake and exhaust connecting pipe, each branch pipe section is provided with an inlet, and the manifold pipe is provided with two inlets and two outlets. The inlet is connected to the cylinder exhaust port through an exhaust flange, and the two outlets share an exhaust flange connected to the turbocharger intake port.

[0025] An engine system includes a plurality of cylinders, a turbocharger, and an intake and exhaust manifold as described in any of the above embodiments, wherein the exhaust ports of the plurality of cylinders are connected to the intake port of the turbocharger through the intake and exhaust manifold.

[0026] A vehicle comprising the engine system as described above.

[0027] The beneficial effects of this invention are:

[0028] The intake and exhaust connecting pipe provided by this invention, through the arrangement of multiple pipe segments and multiple flexible components, connects the multiple pipe segments in series, allowing multiple sub-exhaust channels to be connected via a first connecting channel to form an exhaust channel. This exhaust channel guides the exhaust gas from multiple cylinder exhaust ports to the manifold and into the turbocharger. By completely enclosing the exhaust channel within a heat-insulating cavity composed of sub-insulated channels and a second connecting channel, a heat insulation barrier is formed, effectively reducing heat loss from the high-temperature exhaust gas and retaining the heat in the high-temperature combustion gas. This allows for more energy to drive the turbocharger, improving the energy utilization rate of the engine system; simultaneously, it reduces thermal damage to other components of the engine system caused by the high-temperature exhaust gas. When the multiple pipe segments undergo thermal deformation due to the high-temperature exhaust gas, the flexible adjustment characteristics of the flexible components can absorb the axial thermal deformation caused by the high-temperature exhaust gas, thereby reducing stress concentration problems caused by high temperatures and improving the reliability of the intake and exhaust connecting pipe. Simultaneously, the flexibility of the flexible components isolates or reduces vibrations from the engine system, reducing the risk of resonance. Furthermore, the deformability of the flexible components allows for a certain degree of installation error, reducing assembly difficulty.

[0029] The engine system provided by this invention uses the aforementioned intake and exhaust connecting pipe to connect the exhaust ports of multiple cylinders and the intake port of the turbocharger. By completely enclosing the exhaust passage within a heat-insulating cavity composed of a sub-insulating channel and a second connecting channel, a heat insulation barrier is formed, effectively reducing heat loss from high-temperature exhaust gases and maintaining the heat in the high-temperature combustion gases. This allows for more energy to drive the turbocharger, improving the energy utilization rate of the engine system. Utilizing the flexible adjustment characteristics of the flexible components, axial thermal deformation caused by high-temperature exhaust gases can be absorbed, thereby reducing stress concentration problems caused by high temperatures and improving the reliability and durability of the engine system.

[0030] The vehicle provided by this invention, using the aforementioned engine system, improves energy utilization and ensures the reliability and durability of the engine system. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the intake and exhaust connecting pipe provided in a specific embodiment of the present invention;

[0032] Figure 2 This is a cross-sectional view of the intake and exhaust connecting pipe provided in a specific embodiment of the present invention;

[0033] Figure 3 This is a cross-sectional view of the connection between branch pipes provided in a specific embodiment of the present invention;

[0034] Figure 4 This is a partially enlarged cross-sectional view of the connection between the inner corrugated pipe and the first outer corrugated pipe in an embodiment of the present invention.

[0035] Figure 5 yes Figure 2 A magnified view of a portion of point A in the middle.

[0036] In the picture:

[0037] 1. Pipeline; 11. Inner pipe; 111. Inner connecting boss; 12. Outer pipe; 121. Outer connecting boss; 13. Sub-exhaust channel; 14. Sub-insulation channel;

[0038] 101. Branch pipes; 102. Combination pipes;

[0039] 2. Flexible component; 21. Inner bellows; 22. First outer bellows; 23. Transition flange; 231. Positioning convex ring; 24. Second outer bellows; 25. First connecting channel; 26. Second connecting channel;

[0040] 3. Exhaust flange;

[0041] 4. Exhaust flange;

[0042] 5. Hoof clamp;

[0043] 6. Connecting ring. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0046] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0047] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0049] This embodiment provides a vehicle, including an engine system. The engine system is the core power system of the vehicle, and its performance and reliability directly determine the vehicle's power, economy, and environmental friendliness.

[0050] This embodiment also provides an engine system applied to the aforementioned vehicle. The engine system includes multiple cylinders, a turbocharger, and intake / exhaust manifolds. The turbocharger forces air at pressures higher than atmospheric pressure into the cylinders, improving intake efficiency and density, thereby allowing more fuel to be injected to increase engine power and torque. The high-temperature exhaust gases generated by fuel combustion in each cylinder are introduced into the turbocharger through the intake / exhaust manifolds, driving the turbocharger to perform work.

[0051] Because the temperature of the exhaust gas is extremely high, reaching 800℃ or even higher, the temperature of the intake and exhaust manifold walls rises sharply. The intense heat radiation from the intake and exhaust manifold can cause thermal damage to surrounding engine components, such as sensor wiring harnesses, oil lines, and vacuum tubes, affecting their service life and reliability, and posing safety hazards. During the process of introducing high-temperature exhaust gas into the turbocharger, to reduce heat loss, improve the energy utilization rate of the engine system, and reduce thermal damage to other components, a heat shield is typically added to the intake and exhaust manifold for insulation, reducing heat radiation and protecting surrounding components. However, after insulating the intake and exhaust manifold, the internal heat can cause thermal deformation of the pipes, generating enormous thermal stress at the connection points. Over time, this stress fatigue can easily lead to cracking at the connection points between the intake and exhaust manifold and the cylinder exhaust port and turbocharger intake port, severely affecting the engine's reliability and durability.

[0052] This embodiment also provides an intake and exhaust connecting pipe, which is applied to the above-mentioned engine system. The intake and exhaust connecting pipe is used to connect the turbocharger intake port and multiple cylinder exhaust ports. While providing heat insulation, it can absorb the thermal deformation caused by high-temperature exhaust gas, eliminate stress concentration, and thus improve the reliability and durability of the engine system.

[0053] like Figures 1-3 As shown, the intake and exhaust connecting pipe includes multiple pipe segments 1 and multiple flexible components 2. Each pipe segment 1 includes a coaxially arranged sub-exhaust channel 13 and a sub-insulation channel 14, with the sub-insulation channel 14 covering the outside of the sub-exhaust channel 13. Adjacent pipe segments 1 are connected by flexible components 2, which include a first connecting channel 25 and a second connecting channel 26 coaxially arranged. The first connecting channel 25 connects to adjacent sub-exhaust channels 13, and the second connecting channel 26 covers the outside of the first connecting channel 25. Each pipe segment 1 is connected to at least one cylinder exhaust port. The multiple pipe segments 1 are connected in series via the flexible components 2 to form an exhaust channel, which is connected to the turbocharger intake port through a manifold.

[0054] This intake and exhaust connecting pipe, through the arrangement of multiple pipe segments 1 and multiple flexible components 2, connects the multiple pipe segments 1 in series, allowing multiple sub-exhaust channels 13 to be connected via a first connecting channel 25 to form an exhaust channel. This exhaust channel guides the exhaust gas from multiple cylinder exhaust ports to the manifold and into the turbocharger. By completely enclosing the exhaust channel within a heat-insulating cavity formed by sub-insulated channels 14 and a second connecting channel 26, a heat insulation barrier is formed, effectively reducing heat loss from the high-temperature exhaust gas and retaining the heat in the high-temperature combustion gas. This allows for more energy to drive the turbocharger, improving the energy utilization rate of the engine system; simultaneously, it reduces thermal damage to other components of the engine system caused by the high-temperature exhaust gas. When the multiple pipe segments 1 undergo thermal deformation due to the high-temperature exhaust gas, the flexible adjustment characteristics of the flexible components 2 can absorb the axial thermal deformation caused by the high-temperature exhaust gas, thereby reducing stress concentration problems caused by high temperatures and improving the reliability of the intake and exhaust connecting pipe. Simultaneously, the flexibility of the flexible components 2 isolates or reduces vibrations from the engine system, reducing the risk of resonance. Furthermore, the deformability of the flexible components 2 allows for a certain degree of installation error, reducing assembly difficulty.

[0055] In one embodiment, the minimum radial width of the second connecting channel 26 is maintained at 1mm to 3mm. When the flexible component 2 undergoes flexible deformation, it can ensure that the inlet and outlet connecting pipe can absorb axial thermal deformation while ensuring full coverage of the heat insulation channel used for heat insulation along the axial direction, thereby increasing the heat insulation effect.

[0056] In one embodiment, each pipe segment 1 can be configured as a double-layer pipe, with multiple single-layer sub-insulation channels 14 covering the outer periphery of a single-layer exhaust channel, providing thermal insulation. Air is introduced into the sub-insulation channels 14 to provide thermal insulation for the high-temperature exhaust gas in the exhaust channel. Of course, in other embodiments, each pipe segment 1 can be configured with any number of layers depending on the installation space, pipe thickness, and insulation effect. If configured as a three-layer pipe, multiple two-layer sub-insulation channels 14 can cover the outer periphery of a single-layer exhaust channel. With the same pipe thickness, this occupies more space, but the thermal insulation effect is better.

[0057] For example, the flexible component 2 includes an inner flexible member and a first outer flexible member that are sleeved and connected. The pipeline 1 includes an inner pipe 11 and an outer pipe 12. The two ends of the inner flexible member are respectively connected to adjacent inner pipes 11 to connect adjacent sub-exhaust channels 13; the two ends of the first outer flexible member are respectively connected to adjacent outer pipes 12 to connect adjacent sub-insulation channels 14, so that the sub-insulation channels 14 of multiple sections of the pipeline 1 are connected to form an insulation channel. The inlet and outlet connecting pipe is completely covered by the insulation channel along the axial direction, which not only provides heat insulation, but also utilizes the elastic deformation of the flexible component 2 in the axial direction to eliminate the problem of thermal stress concentration caused by thermal deformation of the inner pipe 11 and outer pipe 12 due to temperature rise, thereby improving the working reliability of the inlet and outlet connecting pipe.

[0058] The thickness of the inner tube 11 and the outer tube 12 is generally greater than 3mm. Both the inner tube 11 and the outer tube 12 are made of metal materials, such as stainless steel or other materials, and are manufactured by stamping process. The outer diameter of the inner tube 11 is smaller than the inner diameter of the outer tube 12, so that the inner tube 11 is coaxially sleeved in the outer tube 12, and a sub-insulation channel 14 can be formed between the two.

[0059] The inner flexible component and the first outer flexible component can be configured as two corrugated pipes of different diameters that are sleeved together. The simultaneous expansion and contraction of the two corrugated pipes can absorb the axial deformation of multiple sections of pipeline 1. Of course, the inner flexible component and the first outer flexible component can also be rubber tubes of different diameters that are sleeved together.

[0060] For example, the inner flexible component is an inner bellows 21, and the first outer flexible component is a first outer bellows 22. Both the inner bellows 21 and the first outer bellows 22 are metal bellows. The two ends of the inner bellows 21 are respectively welded to the adjacent inner tube 11, and the two ends of the first outer bellows 22 are respectively welded to the adjacent outer tube 12.

[0061] In one embodiment, such as Figure 4As shown, the inner tube 11 has an inner connecting boss 111 at its end, and the inner bellows 21 is welded to the inner connecting boss 111. The outer tube 12 has an outer connecting boss 121 at its end, and the first outer bellows 22 is welded to the outer connecting boss 121. Both the inner connecting boss 111 and the outer connecting boss 121 are annular bosses. The inner wall of the end of the inner bellows 21 is fitted over the inner connecting boss 111 and welded to it. The first outer bellows 22 is fitted over the outer connecting boss 121 and welded to it. By setting the inner connecting boss 111 and the outer connecting boss 121, the welding area is transferred from the thin-walled, easily deformable corrugated section to the specially designed rigid boss. The high temperature and heat effect generated during the welding process are borne by the rigid boss, avoiding the direct action of thermal stress on the trough or crest of the corrugated section. This completely eliminates the risk of fatigue strength reduction and microcracks caused by high welding temperature, ensuring the service life and reliability of the flexible component 2.

[0062] The height of the inner connecting boss 111 is less than the radial width of the sub-insulation channel 14 to ensure the connectivity between the sub-insulation channel 14 and the second connecting channel 26.

[0063] To ensure that the inner bellows 21 and the first outer bellows 22 never come into contact or interfere with each other during the thermal deformation process, and to maintain the unobstructed flow and function of the second connecting channel 26, the initial gap design is fundamental.

[0064] In one embodiment, such as Figure 4 As shown, the gap between the maximum outer diameter D1 of the inner bellows 21 and the minimum inner diameter D2 of the first outer bellows 22 is 1mm to 3mm to ensure the radial connectivity of the second connecting channel 26; and the maximum length L1 of the corrugated section of the inner bellows 21 is less than the distance L2 between the end faces of two adjacent outer pipes 12 to ensure the axial connectivity of the second connecting channel 26.

[0065] The corrugated geometric parameters such as wave depth and wave pitch of the inner corrugated pipe 21 and the first outer corrugated pipe 22 are designed by co-simulation to ensure that their deformation modes “avoid each other” during axial expansion and radial expansion, thereby further reducing the theoretical possibility of interference under synchronous deformation in the same phase.

[0066] In this embodiment, only the relative diameters and lengths of the inner bellows 21 and the first outer bellows 22 are defined. The specific dimensional values ​​are determined based on the bellows number, thickness, operating temperature, and actual engine operating conditions.

[0067] In one embodiment, the corrugations of the inner bellows 21 and the first outer bellows 22 are staggered, like interlocking gears, so they do not contact each other, which maximizes the use of space and further ensures the connectivity of the second connecting channel 26.

[0068] Of course, in other embodiments, a flexible heat insulation sleeve can also be provided in the second connecting channel 26. The flexible heat insulation sleeve can act as a physical isolation layer to prevent direct scratching caused by instantaneous over-deformation, and can further reduce radial heat radiation and optimize heat preservation performance.

[0069] In one embodiment, such as Figure 3 and Figure 5 As shown, the flexible component 2 also includes a transition flange 23 and a second outer flexible component. The transition flange 23 connects two adjacent pipe sections 1 and blocks the sub-insulation channel 14 of one of the pipe sections 1. The second outer flexible component connects the transition flange 23 to another pipe section 1. Since the assembly process of the first inner flexible component and the first outer flexible component connecting the two ends of the pipe 1 is relatively complex and has strict requirements for manufacturing tolerances and assembly skills, it is not suitable for connecting pipes 1 with complex end face structures (such as arc-shaped pipe walls). The transition flange 23 connects the complex end face of the pipe 1, which greatly simplifies the assembly process.

[0070] For example, in two adjacent pipe sections 1, the inner pipe 11 and outer pipe 12 of one pipe section 1 are both connected to one end of the transition flange 23, and the transition flange 23 blocks its sub-insulation channel 14; the two ends of the sub-insulation channel 14 of the other pipe section 1 are closed, and it is connected to the other end of the transition flange 23. The transition flange 23 blocks one end of the insulation channel 14, forming an independent heat insulation chamber, avoiding "thermal short circuit" or abnormal thermal expansion accumulation caused by uneven overall temperature field or overheating in some areas, making thermal management more controllable. The second external flexible component allows the two adjacent pipe sections 1 connected to generate relative axial, radial, and angular displacements under thermal expansion or engine vibration, effectively isolating thermal stress and mechanical vibration.

[0071] In one embodiment, the second outer flexible member is a second outer corrugated pipe 24, one end of which is connected to a transition flange 23, and the other end is connected to a pipe 1 enclosed by a sub-insulation channel 14.

[0072] Specifically, such as Figure 5As shown, one end of the transition flange 23 is provided with a positioning convex ring 231, which is inserted into the end of the sub-insulation channel 14 of a section of pipe 1. Its end face directly seals the sub-insulation channel 14 of that section of pipe 1, achieving isolation. The positioning convex ring 231 is designed to extend outward, so that its outer peripheral wall forms a smooth cylindrical welding surface. One end of the second outer bellows 24 is fitted onto the outside of the positioning convex ring 231 and a reliable airtight connection is achieved through circumferential welding. The other end of the transition flange 23 is provided with a connecting ring 6, which is used to connect with the outer pipe 12 of another section of pipe 1. Its outer peripheral wall is processed into a stepped structure, forming a large-diameter section and a small-diameter section. The other end of the second outer bellows 24 is fitted onto the outer periphery of the small-diameter section and welded to it. The large-diameter section mates with the end face of the outer pipe 12 of another section of pipe 1 and is tightened and sealed by a hose clamp 5, thereby achieving a fast and reliable mechanical connection and static seal.

[0073] For example, the inner bellows 21, the first outer bellows 22, and the second outer bellows 24 have 2 to 4 corrugations, depending on the axial installation space of the inlet and outlet connecting pipe. The thickness of the inner bellows 21, the first outer bellows 22, and the second outer bellows 24 is generally 0.3 mm to 0.5 mm, which needs to meet the strength requirements of the bellows at high temperatures.

[0074] In one embodiment, continue to refer to Figure 1 and Figure 2 The multi-segment pipeline 1 includes multiple branch pipelines 101 and a manifold 102. The branch pipelines 101 are connected to each other by an inner flexible member and a first outer flexible member. The manifold 102 is connected to the adjacent branch pipelines 101 by a transition flange 23 and a second outer flexible member.

[0075] For example, the engine system includes six cylinders, the pipeline 1 includes four branch pipelines 101, and there are two branch pipelines 101 on each side of the manifold 102. Adjacent branch pipelines 101 are connected by an inner corrugated pipe 21 and a first outer corrugated pipe 22. Since the connection structure of the inner pipe 11 and the outer pipe 12 of the manifold 102 is complex, the branch pipelines 101 and the manifold 102 are connected by a transition flange 23 and a second outer corrugated pipe 24.

[0076] Of course, in other embodiments, the number of segments of the branch pipe 101 can be specifically designed according to the number of cylinders and the space inside the engine, and is not specifically limited here.

[0077] In one embodiment, each branch pipe 101 is provided with an inlet, and the manifold pipe 102 is provided with two inlets and two outlets. The inlet is connected to the cylinder exhaust port through the exhaust flange 3, and the two outlets share an exhaust flange 4 connected to the turbocharger inlet.

[0078] For example, each side of the manifold 102 is connected to two branch pipes 101, forming six inlets and two outlets. Three inlets on one side are connected to one outlet to collect the high-temperature exhaust gas from three cylinders to that outlet; three inlets on the other side are connected to another outlet to collect the high-temperature exhaust gas from the other three cylinders to that outlet.

[0079] When the exhaust flange 3 is connected to the inlet, the inner wall of the exhaust flange 3 is welded to the outer wall of the inner pipe 11, and the end face of the exhaust flange 3 is welded to the end face of the outer pipe 12 to ensure sealing. When the exhaust flange 4 is connected to the two outlets, the two outlets are located on the same end face, and the exhaust flange 4 is welded to the end faces of both the inner and outer pipes 12 to ensure sealing.

[0080] To ensure absolute isolation between the exhaust and insulation channels and prevent gas cross-contamination that could lead to insulation failure or performance degradation, the connections between the inner bellows 21 and the adjacent inner pipe 11, as well as the connections between the first outer bellows 22 and the adjacent outer pipe 12, must meet airtightness requirements. The metal bellows are permanently connected to both the inner pipe 11 and the outer pipe 12 using full penetration welding (such as argon arc welding or laser welding). Extremely high airtightness at the weld is ensured by optimizing the weld structure (e.g., using bevel welding or socket welding) and employing helium mass spectrometry leak detection after welding. When using flange connections, double concentric grooves are machined on the flange sealing surface, and high-temperature metal O-rings or flexible graphite gaskets are installed. A leak detection hole can be installed between the two seals to monitor the inner seal for failure in real time, achieving safety redundancy. Alternatively, one end of the flange can be designed as a spherical flange that mates with a concave spherical surface at the other end, with a sealing ring added in between. This structure ensures a seal while adapting to a certain angle of deflection, mitigating the impact of installation stress and thermal stress on the sealing surface.

[0081] The engine system provided in this embodiment uses the above-mentioned intake and exhaust connecting pipe to connect the exhaust ports of multiple cylinders and the intake port of the turbocharger. By completely covering the exhaust passage with a heat insulation cavity composed of the sub-insulation channel 14 and the second connecting channel 26, a heat insulation barrier is formed, which effectively reduces the heat loss of high-temperature exhaust gas and retains the heat in the high-temperature combustion gas, thereby having more energy to drive the turbocharger to do work and improving the energy utilization rate of the engine system. By utilizing the flexible adjustment characteristics of the flexible component 2, axial thermal deformation caused by high-temperature exhaust gas can be absorbed, thereby reducing stress concentration problems caused by high temperature and improving the reliability and durability of the engine system.

[0082] The vehicle provided in this embodiment uses the engine system described above, which improves energy utilization and ensures the reliability and durability of the engine system.

[0083] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. An intake and exhaust connecting pipe for connecting the intake port of a turbocharger and the exhaust ports of multiple cylinders, characterized in that, include: The pipeline (1) consists of multiple sections, each of which includes an inner pipe (11) and an outer pipe (12), and forms a sub-exhaust channel (13) and a sub-insulation channel (14) arranged coaxially within it. The sub-insulation channel (14) covers the outside of the sub-exhaust channel (13). Multiple flexible components (2) are connected to adjacent pipelines (1) through the flexible components (2). Each flexible component (2) includes an inner flexible member and a first outer flexible member that are sleeved and connected. A first connecting channel (25) and a second connecting channel (26) are formed coaxially inside the flexible component. The inner flexible member is an inner corrugated pipe (21), and the first outer flexible member is a first outer corrugated pipe (22). The two ends of the inner corrugated pipe (21) are respectively welded to the adjacent inner pipe (11), and the two ends of the first outer corrugated pipe (22) are respectively welded to the adjacent outer pipe (12), so that the first connecting channel (25) connects to the adjacent sub-exhaust channel (13), and the second connecting channel (26) covers the outside of the first connecting channel (25) to connect to the adjacent sub-insulation channel (14). Each pipe section (1) is connected to at least one of the cylinder exhaust ports, and multiple pipe sections (1) are connected in series via the flexible component (2) to form an exhaust channel, which is connected to the turbocharger intake port through a manifold. Air is introduced into the sub-insulation channel (14) to provide heat insulation for the high-temperature exhaust gas in the exhaust channel.

2. The inlet and outlet connecting pipe according to claim 1, characterized in that, The minimum radial width of the second connecting channel (26) is maintained at 1 mm to 3 mm.

3. The inlet and outlet connecting pipe according to claim 1, characterized in that, The gap between the maximum outer diameter D1 of the inner corrugated pipe (21) and the minimum inner diameter D2 of the first outer corrugated pipe (22) is 1mm to 3mm; and the maximum length L1 of the corrugated section of the inner corrugated pipe (21) is less than the distance L2 between the end faces of two adjacent outer pipes (12).

4. The inlet and outlet connecting pipe according to claim 1, characterized in that, The inner tube (11) is provided with an inner connecting boss (111) at its end, and the inner corrugated tube (21) is welded to the inner connecting boss (111); The outer tube (12) is provided with an external connecting boss (121) at its end, and the first outer corrugated tube (22) is welded to the external connecting boss (121); The height of the inner connecting boss (111) is less than the radial width of the sub-insulation channel (14).

5. The inlet and outlet connecting pipe according to claim 1, characterized in that, The flexible component (2) also includes a transition flange (23) and a second external flexible component. The transition flange (23) connects two adjacent pipe sections (1) and blocks the sub-insulation channel (14) of one of the pipe sections (1). The second external flexible component is connected to the transition flange (23) and the other pipe section (1).

6. The inlet and outlet connecting pipe according to claim 5, characterized in that, In two adjacent pipe sections (1), the inner pipe (11) and outer pipe (12) of one pipe section (1) are both connected to one end of the transition flange (23), and the transition flange (23) blocks its sub-insulation channel (14); the two ends of the sub-insulation channel (14) of the other pipe section (1) are closed, and are connected to the other end of the transition flange (23).

7. The inlet and outlet connecting pipe according to claim 6, characterized in that, The second external flexible component is a second external corrugated pipe (24), one end of which is connected to the transition flange (23), and the other end is connected to the pipe (1) closed by the sub-insulation channel (14).

8. The inlet and outlet connecting pipe according to claim 5, characterized in that, The multi-segment pipeline (1) includes multiple branch pipelines (101) and a manifold pipeline (102). The branch pipelines (101) are connected to each other through the inner flexible member and the first outer flexible member. The manifold pipeline (102) is connected to the adjacent branch pipelines (101) through the transition flange (23) and the second outer flexible member.

9. The inlet and outlet connecting pipe according to claim 8, characterized in that, Each of the branch pipes (101) has an inlet, and the manifold (102) has two inlets and two outlets. The inlet is connected to the cylinder exhaust port through the exhaust flange (3), and the two outlets share an exhaust flange (4) connected to the turbocharger inlet.

10. An engine system, characterized in that, It includes multiple cylinders, a turbocharger, and an intake and exhaust communication pipe as described in any one of claims 1-9, wherein the exhaust ports of the multiple cylinders are connected to the intake port of the turbocharger through the intake and exhaust communication pipe.

11. A vehicle, characterized in that, Including the engine system as described in claim 10.

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