Soft and hard tube combination is the air outlet pipe assembly of resonant cavity

Abstract

The utility model discloses a kind of air outlet pipe assembly of soft and hard tube combination as resonant cavity, belong to engine intake system technical field, for solving the problem of traditional air cleaner air outlet pipe resonant cavity structure complexity, process is complicated and big mould investment. The assembly includes corrugated hose, hard tube, clamp and rubber sleeve;Hard tube one end is inserted into hose, and sealing resonant cavity is formed by clamp holding and fixing, and the other end of hard tube is equipped with rubber sleeve to connect supercharger;Hose outer peripheral wall is provided with corrugated structure to realize decoupling, and hard tube outer wall is integrated with air supply pipe joint and venturi pipe joint. When working, airflow passes through resonant cavity, attenuates noise by cavity resonance, corrugated structure absorbs vibration, integrated joint meets the functional requirement of whole vehicle, and rubber sleeve realizes sealed connection with supercharger. The utility model replaces traditional welding plastic piece cavity by soft and hard tube combination and clamp connection, saves welding process and additional rubber pipeline, simplifies structure, reduces mould investment, reduces cost, while realizing noise reduction and decoupling function.

Description

Technical Field

[0001] This utility model belongs to the technical field of engine intake system, specifically relating to a resonant cavity structure for an air filter outlet pipe. It is particularly suitable for the pipeline assembly connecting the air filter and the turbocharger in the intake system of an automobile engine. By optimizing the structural design of the resonant cavity, the intake airflow noise reduction function is realized, thereby improving the NVH (noise, vibration and harshness) performance of the whole vehicle and simplifying the system structure. Background Technology

[0002] This utility model relates to the field of air filter outlet pipe technology, specifically applied to the intake system of an automotive engine. It connects the air filter and the turbocharger, and its core function is to attenuate intake airflow noise through a resonant cavity structure, reducing the impact of the engine intake system on the overall vehicle's NVH (noise, vibration, and harshness) performance, while ensuring smooth intake to maintain engine power output. As a key component of the air filter outlet pipe, the resonant cavity's structural design directly affects noise reduction effectiveness, system complexity, and production cost, making it a crucial aspect of optimizing the engine intake system.

[0003] In existing technologies, the resonant cavity of the air filter outlet pipe generally adopts a structural scheme of "multiple plastic parts welded together + independent rubber tube connection". Specifically, the main body of the resonant cavity needs to be formed into a sealed cavity through welding between at least two plastic parts (such as upper and lower shells) to achieve noise reduction; at the same time, in order to adapt to the assembly space and vibration environment in the engine compartment, two independent rubber tubes are usually required at the front and rear of the cavity, respectively for connecting the input end (air filter side) and output end (turbocharger side) of the air filter outlet pipe. This traditional structure has revealed significant shortcomings in long-term application: First, the structure is complex, requiring multiple components such as a plastic welded cavity and independent rubber connecting tubes, resulting in a large number of components and complicated assembly relationships. Secondly, the production process is complicated, relying on the welding process of plastic parts, which makes it difficult to control the welding quality and requires additional treatment of problems such as burrs and stress after welding. Third, the investment in molds is large. Since the resonant cavity relies on the combination of multiple plastic parts, a mold needs to be developed separately for each plastic part, resulting in high R&D costs in the early stage and high mass production costs in the later stage.

[0004] Existing technologies focus on the relationship between "rigid connection of plastic parts to form a sealed cavity" and the noise reduction function of the resonant cavity. Their core design logic is to ensure the volume stability of the cavity through the rigid structure of the plastic parts, thereby achieving resonant frequency matching to achieve noise reduction. Correspondingly, to meet connection requirements, an additional rubber tube is needed to absorb vibration, forming a separate structure of "rigid cavity + flexible connection." This patent application, however, establishes a novel technical route that forms a sealed cavity through a combination of "flexible flexible tubing and rigid tubing." It directly uses the flexible tubing as the main body of the cavity, utilizing the flexibility of the tubing itself to achieve sealing and vibration absorption, eliminating the need for a separate rubber connecting tube.

[0005] In the early development of air filter outlet resonant cavities, limited by material properties and processing technology, welding plastic parts was the most reliable way to achieve a sealed cavity. Subsequent technological improvements mainly focused on optimizing welding processes and reducing the number of plastic parts, failing to break through the inherent framework of "rigid connection of plastic parts." Even after the performance of flexible materials such as TPV improved and clamp connection technology matured, those skilled in the art remained limited by traditional design thinking and failed to realize that "combination of soft and hard materials + clamp connection" could replace the welded plastic cavity, resulting in the long-standing problems of complex structure and high cost in existing technologies.

[0006] Therefore, addressing the core shortcomings of existing air filter outlet resonant cavities—namely, their complex structure, cumbersome manufacturing process, and high mold investment—an improved solution is urgently needed that simplifies the structure, optimizes the process, and reduces costs to meet the automotive industry's demands for lightweight and low-cost components. Based on this necessity, this invention proposes an outlet cavities assembly that forms a resonant cavity through a combination of rigid and flexible tubes, aiming to fundamentally solve the deficiencies of existing technologies. Utility Model Content

[0007] The purpose of this invention is to provide an exhaust pipe structure that can form a sealed resonant cavity by combining soft and hard pipes, so as to overcome the defects of the prior art that rely on welding multiple plastic parts, resulting in complex structure, cumbersome process and large mold investment.

[0008] To achieve the above objectives, the flexible and rigid tube combination of this utility model constitutes an exhaust pipe assembly for a resonant cavity, comprising a flexible cavity component for forming the main body of the resonant cavity, a rigid channel component that cooperates with the flexible cavity component to form a sealing structure, and a first fastening component for fixing and sealing the flexible cavity component and the rigid channel component; the flexible cavity component is provided with an annular baffle protruding radially inward inside. The annular baffle is located at the innermost end of the corrugated section of the flexible cavity component; one end of the rigid channel component is inserted into the flexible cavity component, and its end face abuts against the annular baffle to form an axial sealing line, and the insertion depth is positioned by the annular baffle; The first fastening component is sleeved on the connection between the flexible cavity component and the rigid channel component and is held and fixed, so that the flexible cavity component, the rigid channel component and the annular baffle together form a sealed resonant cavity; the rigid channel component at the resonant cavity has multiple radially penetrating through holes on its wall; the other end of the rigid channel component has a transition connection component that can be connected to the booster.

[0009] The corrugated section of the flexible cavity component extends along the axial direction of the flexible cavity component and is used to achieve the decoupling function. The height difference between the crest and trough of the corrugated section is 3 to 10 mm.

[0010] The outer wall of the rigid channel component is fixedly connected to at least two fluid interface components that can realize the functions of the whole vehicle. The fluid interface components include an air inlet pipe interface and a venturi pipe connector.

[0011] The transition connection component is inserted into the end of the rigid channel component away from the flexible cavity component in an interference fit manner, and the outer wall of the transition connection component is in close contact with the inner wall of the rigid channel component.

[0012] It also includes a second fastening component that can fix the input end of the flexible cavity component and a third fastening component that can fix the output end of the rigid channel component; the second fastening component is sleeved on the end of the flexible cavity component away from the rigid channel component, and the third fastening component is sleeved on the end of the rigid channel component near the transition connection component.

[0013] The rigid channel component has a bent portion, and the bent portion is provided with a cover plate component for sealing the end of the resonant cavity. The cover plate component is fixedly connected to the rigid channel component.

[0014] This utility model has the following advantages: The annular baffle abuts against the end face of the rigid channel component (hard tube) to form an annular end face sealing line, preventing the pulsating airflow in the resonant cavity from leaking axially downstream, ensuring the integrity of the acoustic boundary of the resonant cavity, and avoiding noise reduction frequency drift caused by leakage; By using the contact relationship between the end face of the rigid tube and the baffle, the insertion depth of the rigid channel component (rigid tube) is fixed, so that the overlap length L of the flexible cavity component (soft tube) and the rigid channel component (rigid tube) remains constant, thereby ensuring the stability of the resonant cavity volume and achieving precise noise reduction at the target frequency (such as about 2kHz). The baffle and hose are integrally molded and combined with the first fastening component (second clamp) to form a sealed resonant cavity without additional assembly parts or welding processes. This replaces the complex structure of "multiple plastic parts welding + independent rubber tubes" in traditional technology, simplifying the structure, reducing the number of parts and mold investment, and reducing process complexity.

[0015] The transition connection component (rubber sleeve) directly achieves a sealed connection with the turbocharger, eliminating the need for additional rubber connecting pipes in the traditional structure and further simplifying the system.

[0016] The corrugated structure is integrated into the flexible cavity component, absorbing engine vibration energy through its own elastic deformation, reducing the transmission of vibration to the entire vehicle, and achieving pipeline decoupling. This eliminates the need for an additional independent corrugated pipe, further simplifying the structure. Specifically, the flexible nature of the corrugated structure allows for minute axial and radial displacement compensation during pipeline vibration, avoiding vibration amplification caused by rigid transmission and improving system stability.

[0017] This invention reduces the number of independent connectors and simplifies pipeline layout by integrating a fluid interface component, meeting functional requirements such as vehicle air replenishment and Venturi effect adjustment, and reducing assembly complexity. Specifically, the fluid interface component is connected to the rigid channel component (hard pipe), allowing external fluids (such as replenishment air and control air) to directly enter or exit the airflow channel after the resonant cavity without the need for additional connecting pipelines, thereby improving structural integration and reducing assembly complexity.

[0018] The interference fit achieves a sealed connection between the rigid channel component (hard tube) and the turbocharger, replacing the multi-component connection method of "hard tube + independent rubber tube + turbocharger" in the traditional structure, saving rubber materials and shortening the assembly path.

[0019] The second fastening component (first clamp) and the third fastening component (third clamp) respectively enable the flexible cavity component (hose) to be detachably fixed to the air filter and the rigid channel component (hard pipe) to the downstream pipeline, improving the convenience of assembly and maintenance. Specifically, the clamping force of the clamps fixes the pipeline to the external interface, ensuring the airtightness and connection reliability of the airflow passage, while facilitating subsequent disassembly and maintenance.

[0020] The cover plate component (rigid pipe cover) closes the bent part of the rigid channel component. After opening, it is convenient to observe the internal condition of the rigid channel component and the condition of the connection between each fluid interface component and the rigid channel component. If necessary, it can be cleaned, such as cleaning the impurities left during welding of each fluid interface component. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model.

[0022] Figure 2 yes Figure 1 Top view.

[0023] Figure 3 yes Figure 2 BB cross-sectional view.

[0024] Figure 4 yes Figure 1 CC section view. Detailed Implementation

[0025] like Figures 1 to 4 As shown, the flexible and rigid tube combination of this utility model constitutes an exhaust pipe assembly for a resonant cavity, including a flexible cavity component (i.e., flexible hose 1) for forming the main body of the resonant cavity, a rigid channel component (rigid tube 2) that cooperates with the flexible cavity component (flexible hose 1) to form a sealing structure, and a first fastening component (i.e., a second clamp 9) for fixing and sealing the flexible cavity component (flexible hose 1) and the rigid channel component (rigid tube 2); the interior of the flexible cavity component (flexible hose 1) is provided with an annular baffle 11 that protrudes radially inward; the flexible hose 1 has a corrugated section 15.

[0026] The annular baffle 11 is an integrally formed inner convex ring of the flexible cavity component (hose 1) during injection blow molding, located at the innermost end of the corrugated section 15 of the flexible cavity component (hose 1); one end of the rigid channel component (hard tube 2) is inserted into the flexible cavity component (hose 1), and its end face abuts against the annular baffle 11 to form an axial sealing line, and the insertion depth is positioned by the annular baffle 11; The first fastening component (second clamp 9) is sleeved on the connection between the flexible cavity component (soft hose 1) and the rigid channel component (hard tube 2) and is tightly fixed, so that the flexible cavity component (soft hose 1), the rigid channel component (hard tube 2) and the annular baffle 11 together form a sealed resonant cavity 12; the rigid channel component at the resonant cavity 12 has multiple radially penetrating through holes 13 on its wall (these through holes 13 serve as acoustic channels, allowing airflow noise in the rigid channel component to enter the resonant cavity 12, thereby achieving sound absorption and noise reduction). The other end of the rigid channel component (hard tube 2) is provided with a transition connection component (i.e., rubber sleeve 8) that can be connected to the booster.

[0027] The annular baffle 11 is made of TPV material and integrally formed with the flexible cavity component (hose 1) through injection molding. The height of the raised ring is 2-4mm, and the inner diameter is slightly smaller than the outer diameter of the rigid channel component (hard pipe 2) to ensure an interference fit seal when the hard pipe end faces meet. Its axial position is located at the transition between the corrugated section 15 and the straight section of the flexible cavity component (hose 1), that is, "the innermost end of the corrugated section 15". The rigid channel component (hard pipe 2) is made of PA6-GF30 material; the first fastening component (second clamp 9) is a hose clamp type clamp.

[0028] The annular baffle 11 abuts against the end face of the rigid channel component (hard tube 2) to form an annular end face sealing line, preventing the pulsating airflow in the resonant cavity 12 from leaking axially downstream, ensuring the integrity of the acoustic boundary of the resonant cavity 12, and avoiding noise reduction frequency drift caused by leakage. By using the contact relationship between the end face of the rigid tube and the baffle, the insertion depth of the rigid channel component (rigid tube 2) is fixed, so that the overlap length L between the flexible cavity component (flexible tube 1) and the rigid channel component (rigid tube 2) remains constant, thereby ensuring the stability of the volume of the resonant cavity 12 and achieving precise noise reduction at the target frequency (such as about 2kHz). The baffle and hose are integrally formed. Combined with the first fastening component (second clamp 9), the sealed resonant cavity 12 can be formed without additional assembly parts and welding process. This replaces the complex structure of "multiple plastic parts welding + independent rubber tube" in the traditional technology, which simplifies the structure, reduces the number of parts and mold investment, and reduces the complexity of the process.

[0029] The transition connection component (rubber sleeve 8) directly achieves a sealed connection with the turbocharger, eliminating the need for additional rubber connecting pipes in the traditional structure and further simplifying the system.

[0030] The annular baffle 11 ensures structural strength through "material integration", achieves sealing through "interference fit", and fixes the cavity length through "axial positioning". The three work together to enable the "soft and hard tube combined resonant cavity 12" to have stable volume and sealing without welding, avoiding noise reduction frequency drift caused by inconsistent insertion depth.

[0031] The noise reduction principle of this utility model is as follows: the elastic deformation of the TPV hose and the radial clamping force of the first fastening component (second clamp 9) are used to achieve sealing. The rigid channel component (hard pipe 2) provides a gas flow path and supports the shape of the resonant cavity 12. The cavity volume formed by the two is matched with the airflow frequency to achieve resonant noise reduction.

[0032] The corrugated section 15 of the flexible cavity component (hose 1) extends axially along the flexible cavity component (hose 1) and is used to achieve decoupling. The height difference between the crest and trough of the corrugated section 15 is 3-10mm (the specific value can be adjusted according to the decoupling requirements). The corrugated structure is integrated into the flexible cavity component and absorbs engine vibration energy through its own elastic deformation, reducing the transmission of vibration to the whole vehicle and achieving pipeline decoupling. There is no need to set up an additional independent corrugated pipe, further simplifying the structure. Specifically, the flexible characteristics of the corrugated structure enable the pipeline to generate small axial and radial displacement compensation during vibration, avoiding vibration amplification caused by rigid transmission and improving system stability.

[0033] The outer wall of the rigid channel component (hard pipe 2) is fixedly connected to at least two fluid interface components that can realize the functions of the whole vehicle. The fluid interface components include an air injection pipe interface and a venturi pipe connector 5.

[0034] The air supply pipe interface includes a first air supply pipe connector 4 and a second air supply pipe connector 6. The first air supply pipe connector 4, the second air supply pipe connector 6 and the Venturi pipe connector are fixedly connected to the outer wall of the rigid channel component (hard pipe 2) by welding and are connected to the internal channel of the rigid channel component (hard pipe 2).

[0035] This invention reduces the number of independent connectors and simplifies pipeline layout by integrating fluid interface components, thereby meeting functional requirements such as vehicle air replenishment and Venturi effect adjustment, and reducing assembly complexity. Specifically, the fluid interface component is connected to the rigid channel component (hard pipe 2), allowing external fluids (such as replenishment air and control air) to directly enter or exit the airflow channel after the resonant cavity 12 without the need for additional connecting pipelines, thus improving structural integration and assembly complexity.

[0036] The transition connection component (i.e., rubber sleeve 8) is inserted into the end of the rigid channel component (hard tube 2) away from the flexible cavity component (soft tube 1) in an interference fit manner, and the outer wall of the transition connection component (rubber sleeve 8) is tightly fitted to the inner wall of the rigid channel component (hard tube 2). The transition connection component (rubber sleeve 8) is made of oil-resistant rubber material (such as nitrile rubber).

[0037] The interference fit achieves a sealed connection between the rigid channel component (rigid tube 2) and the turbocharger, replacing the multi-component connection method of "rigid tube + independent rubber tube + turbocharger" in the traditional structure, saving rubber materials and shortening the assembly path.

[0038] After installation on the vehicle, the elastic deformation of the rubber material fills the gap between the rigid channel component (hard tube 2) and the turbocharger interface, achieving a seal and absorbing the relative vibration between the two.

[0039] This utility model also includes a second fastening component (first clamp 7) for fixing the input end of the flexible cavity component (hose 1) and a third fastening component (third clamp 10) for fixing the output end of the rigid channel component (hard tube 2); the second fastening component (first clamp 7) is sleeved on the end of the flexible cavity component (hose 1) away from the rigid channel component (hard tube 2), and the third fastening component (third clamp 10) is sleeved on the end of the rigid channel component (hard tube 2) near the transition connection component (rubber sleeve 8).

[0040] The second fastening component (first clamp 7) and the third fastening component (third clamp 10) are both hose clamp type clamps, with the same structure as the first fastening component (second clamp 9).

[0041] The second fastening component (first clamp 7) and the third fastening component (third clamp 10) respectively enable the flexible cavity component (hose 1) to be detachably fixed to the air filter and the rigid channel component (hard pipe 2) to the downstream pipeline, improving the convenience of assembly and maintenance. Specifically, the clamping force of the clamps fixes the pipeline to the external interface, ensuring the sealing and connection reliability of the airflow passage, while facilitating subsequent disassembly and maintenance.

[0042] The rigid channel component has a bent portion 14, and the bent portion 14 is provided with a cover plate component (i.e., rigid tube cover 3) for sealing the end of the resonant cavity 12. The cover plate component (rigid tube cover 3) is fixedly connected to the rigid channel component (rigid tube 2). The cover plate component (rigid tube cover 3) is fixedly connected to the end of the rigid channel component (rigid tube 2) by welding.

[0043] The cover plate component (rigid pipe cover 3) closes the bent part 14 of the rigid channel component. After opening, it is convenient to observe the internal condition of the rigid channel component and the condition of the connection between each fluid interface component and the rigid channel component. If necessary, it can be cleaned, such as cleaning the impurities left by welding of each fluid interface component.

[0044] The assembly and use of this utility model are described below.

[0045] I. Assembly process: precise assembly and sealing coordination with the annular baffle 11 as the core.

[0046] (a) Pre-assembly of rigid pipe components: integration of functional interfaces and structural reinforcement.

[0047] First, the rigid pipe 2 (PA6-GF30 rigid channel component) is pre-assembled: the first air injection pipe connector 4, the venturi pipe connector 5, and the second air injection pipe connector 6 are fixedly connected to the outer wall of the rigid pipe 2 by welding. These connectors are spaced apart along the axial direction of the rigid pipe 2 and are used to connect the vehicle's air injection pipeline and the venturi pipe, respectively, to meet the requirements of air injection and airflow regulation functions. Therefore, it is necessary to ensure that each connector is connected to the internal channel of the rigid pipe. Simultaneously, the rigid pipe cap 3 is welded to the end of the bend 14. This step integrates a multi-functional interface into the rigid pipe 2 through welding, reducing the number of independent connectors and laying the foundation for subsequent vehicle pipeline connections.

[0048] (ii) Connection of soft and hard tube core: Positioning and sealing function of annular baffle 11.

[0049] Annular baffle 11 guides insertion: The pre-assembled rigid tube 2 is inserted axially into the flexible tube 1 (TPV flexible cavity component). An annular baffle 11 is located at the innermost end of the corrugated section 15 of the flexible tube 1. This baffle is an integrally formed inner convex ring (TPV material, convex ring height 2-4mm, inner diameter slightly smaller than the outer diameter of the rigid tube 2) during injection blow molding of the flexible tube 1. Its axial position is located at the transition between the corrugated section 15 and the straight section. When the rigid tube 2 is inserted, its end face slides along the inner wall of the flexible tube 1 until it completely abuts against the end face of the annular baffle 11. At this point, the baffle, through physical blocking, uniquely fixes the insertion depth of the rigid tube 2, keeping the overlap length L between the flexible tube 1 and the rigid tube 2 constant (e.g., L=50mm, the specific value is designed according to the target resonant frequency).

[0050] Axial sealing line formation: Since the inner diameter of the annular baffle 11 is slightly smaller than the outer diameter of the rigid tube 2, when the end face of the rigid tube abuts against the baffle, the inner convex ring of the baffle will undergo slight elastic deformation due to the compression of the rigid tube, forming a ring-shaped "axial sealing line" (interference fit seal) with the end face of the rigid tube. This sealing line can prevent airflow from leaking axially along the gap between the outer wall of the rigid tube and the inner wall of the flexible tube, ensuring the integrity of the acoustic boundary of the resonant cavity 12. If this baffle is missing, the insertion depth of the rigid tube 2 will vary randomly due to assembly errors, resulting in an unstable overlap length L, subsequent fluctuations in the volume of the resonant cavity 12, and a drift in the noise reduction frequency point (e.g., 2kHz).

[0051] Radial clamping for enhanced sealing: A second clamp 9 (throat clamp type clamp) is fitted at the connection between the flexible hose 1 and the rigid pipe 2 (i.e., the middle of the overlapping section). The clamp is tightened with bolts to generate radial clamping force. The TPV material of the flexible hose 1 is elastic. Under the clamping action, the inner wall of the flexible hose will further adhere to the outer wall of the rigid pipe 2, forming a "radial seal". At the same time, the pressure of the clamp will enhance the contact force between the annular baffle 11 and the end face of the rigid pipe, strengthening the sealing performance of the "axial sealing line". Finally, the flexible hose 1 (flexible cavity), the rigid pipe 2 (rigid channel), the annular baffle 11 (axial sealing and positioning), and the second clamp 9 (radial clamping) together form a sealed, constant-volume resonant cavity 12.

[0052] (iii) Auxiliary fixing and transition connection: integrity of the entire system assembly.

[0053] External interface clamp installation: A first clamp 7 is fitted onto the end of the hose 1 furthest from the rigid pipe 2 (air filter connection end), and a third clamp 10 is fitted onto the end of the rigid pipe 2 closest to the transition connection component (downstream pipeline end). The first clamp 7 is used to subsequently fix the hose 1 to the air filter outlet, and the third clamp 10 is used to fix the rigid pipe 2 to the downstream pipeline before the turbocharger. Both achieve a detachable and sealed connection through the clamping force, facilitating disassembly and maintenance later.

[0054] Turbocharger transition connection assembly: Insert the rubber sleeve 8 (oil-resistant nitrile rubber material) into the end of the rigid tube 2 away from the flexible tube 1 with an interference fit, so that the outer wall of the rubber sleeve fits tightly against the inner wall of the rigid tube. The elastic deformation of the rubber sleeve 8 can compensate for the assembly gap between the rigid tube 2 and the turbocharger interface, achieve a sealed connection, and absorb the relative vibration between the engine and the turbocharger.

[0055] II. Operation process: All components work together to achieve the integration of "noise reduction - decoupling - functional integration".

[0056] (a) Airflow enters and decouples from corrugated section 15: initial absorption of vibration energy.

[0057] Air, filtered by an air filter, enters through the inlet end of hose 1. The outer periphery of hose 1 is provided with corrugated sections 15, the height difference between the crests and troughs of which is 3–10 mm, extending axially. When the engine vibrates during operation, the corrugated sections 15 compensate by undergoing slight displacements axially and radially through their own elastic deformation, absorbing vibration energy and preventing vibration from being transmitted to the entire vehicle through the pipeline (decoupling function). At this time, the flexibility of the corrugated sections 15 and the TPV material properties of hose 1 work together to ensure smooth airflow while blocking the vibration transmission path.

[0058] (ii) Noise reduction of resonant cavity 12: volume stability and frequency matching dominated by annular baffle 11.

[0059] A small amount of airflow, buffered by the corrugated section 15, enters the resonant cavity 12 enclosed by the flexible tube 1 and the rigid tube 2, while most of the airflow passes directly through the rigid tube 2. At this point, the crucial role of the annular baffle 11 becomes apparent: Constant volume control: Since the annular baffle 11 positions the insertion depth of the rigid tube 2, the overlapping section length L of the resonant cavity 12 remains constant (e.g., L=50mm). Combined with the inner diameter of the flexible tube 1 and the outer diameter of the rigid tube 2, the volume V of the resonant cavity 12 is uniquely determined: V=π×(R²-r²)×L, where R is the inner diameter of the flexible tube and r is the outer diameter of the rigid tube.

[0060] Precise frequency matching: The volume V is precisely matched with the pulsating frequency of the intake airflow (e.g., 2kHz). The airflow resonates within the cavity, converting acoustic energy into heat energy in the cavity wall material and dissipating it, thereby attenuating noise in the pulsating frequency band. If L changes due to the absence of a baffle, V will fluctuate accordingly, and the resonant frequency will deviate from the target value, rendering the noise reduction effect ineffective.

[0061] Double sealing guarantee: the axial sealing line between the annular baffle 11 and the end face of the rigid pipe prevents airflow from leaking along the axial direction, and the radial clamping force of the second clamp 9 prevents airflow from leaking along the radial direction. The double sealing ensures the integrity of the acoustic boundary of the resonant cavity 12, and the noise attenuation efficiency is significantly improved compared with the leakage condition without baffle.

[0062] (III) Airflow diversion and functional interface coordination: integrated fulfillment of vehicle requirements.

[0063] After noise reduction, the airflow enters the interior of rigid tube 2. At this time, the first air supply tube connector 4, the Venturi tube connector 5, and the second air supply tube connector 6 begin to work together: Air replenishment function: The first air replenishment pipe connector 4 and the second air replenishment pipe connector 6 are connected to an external air replenishment device to replenish air into the rigid pipe according to the vehicle's operating conditions (such as insufficient air intake during acceleration) to improve engine power output; Airflow regulation: The Venturi tube connector 5 utilizes the principle of "narrow channel speed increase and pressure reduction" to regulate the airflow pressure and velocity in the rigid tube, optimize the uniformity of air intake, and avoid the impact of airflow pulsation on the turbocharger impeller.

[0064] Each interface is integrated with the rigid pipe by welding, eliminating the need for additional pipe connections, reducing flow resistance loss (flow resistance is reduced by 15%), and simplifying the overall vehicle piping layout.

[0065] (iv) Transition connection and supercharger docking: vibration isolation and final sealing.

[0066] After functional adjustment, the airflow flows along the rigid pipe 2 to the end and enters the turbocharger through the rubber sleeve 8. The oil-resistant rubber material of the rubber sleeve 8 is adapted to the high-temperature oily environment of the engine compartment, and its interference fit structure ensures that there is no airflow leakage; at the same time, the elastic deformation of the rubber sleeve absorbs the relative vibration between the turbocharger and the rigid pipe, preventing the vibration from being transmitted in the reverse to the resonant cavity 12 and causing volume fluctuations, further ensuring noise reduction stability.

[0067] III. Summary of Collaborative Working Principles

[0068] This technology achieves innovation through "annular baffle 11 as the core and multiple components working together": Integrated positioning, sealing, and volume control: The annular baffle 11, through its "one-piece molded inner convex ring" design, simultaneously achieves rigid tube insertion depth positioning (constant L), axial sealing line formation (preventing leakage), and stable volume of the resonant cavity 12 (precise V), solving the defects of traditional welded cavities such as "volume fluctuation and unreliable sealing". Synergistic combination of soft and hard materials and fastening: The elastic deformation of the TPV hose, the rigid support of the PA6-GF30 rigid hose, and the clamping force of the hose clamp form a composite structure of "flexible sealing + rigid support + detachable fastening", which replaces the traditional "multiple plastic parts welding + independent rubber hose", simplifying the process and reducing costs. Functional integration and vibration isolation: The corrugated section 15 is decoupled, the functional interface is integrated, and the rubber sleeve is used for transition connection. It works together from three dimensions: vibration source (engine), noise transmission (pipeline), and functional requirements (air replenishment / adjustment) to achieve the integration of "noise reduction-decoupling-function", improve the NVH performance of the whole vehicle, and reduce assembly time.

[0069] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A flexible and rigid tube combination forming the exhaust pipe assembly of a resonant cavity, characterized in that: It includes a flexible cavity component for forming the main body of the resonant cavity, a rigid channel component that cooperates with the flexible cavity component to form a sealing structure, and a first fastening component for fixing and sealing the flexible cavity component and the rigid channel component; the flexible cavity component has an annular baffle protruding radially inward inside. The annular baffle is located at the innermost end of the corrugated section of the flexible cavity component; one end of the rigid channel component is inserted into the flexible cavity component, and its end face abuts against the annular baffle to form an axial sealing line, and the insertion depth is positioned by the annular baffle; The first fastening component is sleeved on the connection between the flexible cavity component and the rigid channel component and is held and fixed, so that the flexible cavity component, the rigid channel component and the annular baffle together form a sealed resonant cavity; the rigid channel component at the resonant cavity has multiple radially penetrating through holes on its wall; the other end of the rigid channel component has a transition connection component that can be connected to the booster.

2. The exhaust pipe assembly according to claim 1, characterized in that: The corrugated section of the flexible cavity component extends along the axial direction of the flexible cavity component and is used to achieve the decoupling function. The height difference between the crest and trough of the corrugated section is 3 to 10 mm.

3. The exhaust pipe assembly according to claim 1, characterized in that: The outer wall of the rigid channel component is fixedly connected to at least two fluid interface components that can realize the functions of the whole vehicle. The fluid interface components include an air inlet pipe interface and a venturi pipe connector.

4. The exhaust pipe assembly according to claim 1, characterized in that: The transition connection component is inserted into the end of the rigid channel component away from the flexible cavity component in an interference fit manner, and the outer wall of the transition connection component is in close contact with the inner wall of the rigid channel component.

5. The exhaust pipe assembly according to claim 1, characterized in that: It also includes a second fastening component that can fix the input end of the flexible cavity component and a third fastening component that can fix the output end of the rigid channel component; the second fastening component is sleeved on the end of the flexible cavity component away from the rigid channel component, and the third fastening component is sleeved on the end of the rigid channel component near the transition connection component.

6. The exhaust pipe assembly according to claim 3, characterized in that: The rigid channel component has a bent portion, and the bent portion is provided with a cover plate component for sealing the end of the resonant cavity. The cover plate component is fixedly connected to the rigid channel component.

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