Automobile air conditioner air pipe with noise reduction structure

Abstract

The utility model discloses an automobile air conditioner air pipe with a noise reduction structure. The automobile air conditioner air pipe comprises a flow guide shell, a noise reduction layer and a vibration reduction frame. Spiral flow guide ribs are arranged on the inner wall of the flow guide shell, the noise reduction layer is made of porous sound absorption materials and covers rib grooves, and the vibration reduction frame disperses vibration energy through elastic supporting strips. The flange plate and the sealing ring ensure airflow tightness, and the overhaul window is convenient to maintain. The thickness of the noise reduction layer is gradually changed, noise absorption and airflow smoothness are considered, and the vibration absorption effect is optimized through the elastic supporting strips. By means of the modular design, airflow noise and vibration transmission are effectively reduced, the mute performance of the air conditioning system is improved, and the air conditioning system is suitable for upgrading and reconstruction of various vehicle types and has high practicability and economical efficiency.

Description

Technical Field

[0001] This utility model relates to the field of automotive air conditioning system technology, and in particular to an automotive air conditioning duct with a noise reduction structure. Background Technology

[0002] In automotive air conditioning systems, ducts serve as crucial airflow channels, and their design and performance directly impact the user experience. Due to the limited space and complex structure of a car's interior, air conditioning ducts are prone to noise generation caused by changes in airflow velocity or friction between the duct walls. This noise is particularly pronounced during high-speed driving or when the air conditioning is under heavy load, exacerbating the noise problem. Traditional automotive air conditioning ducts typically employ a smooth inner wall design to reduce airflow resistance, but this approach has limited effectiveness in suppressing mid-to-high frequency noise, failing to meet users' demands for a quiet environment. Furthermore, while some ducts improve noise reduction by adding sound insulation materials, this increases overall weight and occupies more installation space, posing challenges to vehicle lightweighting and compact layout. Utility Model Content

[0003] The purpose of this utility model is to provide an automotive air conditioning duct with a noise reduction structure, which solves the problems mentioned in the background art.

[0004] This invention is implemented as follows: an automotive air conditioning duct with a noise reduction structure. The duct mainly consists of a guide shell, a noise reduction layer disposed on the inner wall of the guide shell, and a vibration damping frame fixed to the outer side of the guide shell. The guide shell is a hollow cylindrical structure with spiral guide ribs on its inner wall. These ribs are evenly distributed along the airflow direction to guide the airflow into a stable flow path. The noise reduction layer is fixed to the inner wall of the guide shell by adhesive bonding and covers the grooved area between the guide ribs. The noise reduction layer is made of porous sound-absorbing material with numerous micropores on its surface to absorb mid-to-high frequency noise. The vibration damping frame is connected to the outer wall of the guide shell by snap-fit. Elastic support strips are embedded inside the vibration damping frame, with both ends contacting the outer wall of the guide shell and the inner side of the vibration damping frame, respectively, to disperse vibration energy and reduce noise transmission caused by external vibrations.

[0005] The air guide housing has flanges at both ends, which are bolted to the air outlet and inlet of the automotive air conditioning system. A silicone sealing ring is installed inside the flange to prevent airflow leakage and further reduce noise. A removable maintenance window is located in the middle of the air guide housing, connected to the housing via a hinge and closed magnetically for easy cleaning and maintenance of the duct interior. The noise reduction layer thickness is designed with a gradual distribution based on the duct length and airflow velocity; the layer is thicker near the duct inlet to absorb noise generated by the initial airflow impact, and thinner near the duct outlet to ensure smooth airflow discharge.

[0006] The outer side of the vibration damping frame is equipped with several mounting lugs, which are fixed to pre-set mounting points on the vehicle body with screws. Rubber gaskets, 3mm to 5mm thick, are placed between the mounting lugs and the vehicle body to isolate the impact of vehicle body vibrations on the duct. The inner side of the vibration damping frame is equipped with several raised limiting blocks, with a 1mm to 2mm gap between the limiting blocks and the outer wall of the guide housing to prevent structural deformation due to thermal expansion and contraction from affecting assembly accuracy. The number of elastic support strips is evenly distributed according to the length of the duct. Each elastic support strip has an elliptical cross-section, with its major axis parallel to the duct axis, to improve bending resistance and optimize vibration absorption.

[0007] The cross-section of the airflow guide ribs is arc-shaped, with its curvature matching the airflow velocity to reduce turbulence within the airflow guide housing. The height of the airflow guide ribs gradually decreases from the duct inlet to the outlet to accommodate changes in airflow velocity and reduce airflow resistance. The micropores in the noise reduction layer have a diameter ranging from 0.5 mm to 1 mm and a spacing of 2 mm to 3 mm. The micropores are arranged in a staggered pattern to improve noise absorption efficiency and prevent airflow blockage. A grid-like reinforcing rib is provided on the back of the noise reduction layer, with a thickness of 0.8 mm to 1.2 mm, to enhance the overall strength of the noise reduction layer and prevent it from collapsing during long-term use.

[0008] This invention effectively solves the noise problem generated by traditional automotive air conditioning ducts during high-speed airflow or high-load operation through a combination of a guide shell, a noise reduction layer, and a vibration damping frame. The guide ribs optimize the airflow path and reduce turbulence; the porous structure of the noise reduction layer efficiently absorbs mid-to-high frequency noise, while the gradually varying thickness design ensures smooth airflow; the vibration damping frame and its internal elastic support strips significantly reduce the impact of external vibrations on the duct, thereby further improving the overall noise reduction effect. Furthermore, the combined use of flanges and sealing rings not only ensures airflow sealing but also further reduces noise caused by airflow leakage. The inspection window design improves the ease of duct maintenance and extends its service life.

[0009] This invention features a compact structure and lightweight design, significantly improving the noise reduction performance of automotive air conditioning systems without occupying additional space, thus meeting users' demands for a comfortable driving environment. Furthermore, its modular design facilitates manufacturing and installation, offering high practicality and economy, and making it suitable for upgrading and retrofitting air conditioning systems in various vehicle models. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0011] Figure 2 This is a side view of the present invention;

[0012] Figure 3 This is a cross-sectional view of the present invention.

[0013] The attached diagram is labeled as follows: 1. Flow guide shell; 2. Noise reduction layer; 3. Vibration damping frame; 4. Flow guide ribs; 5. Flange; 6. Inspection window; 7. Elastic support strip; 8. Mounting ear plate; 9. Rubber gasket; 10. Sealing ring. Detailed Implementation

[0014] This utility model relates to an automotive air conditioning duct with a noise reduction structure, and its specific implementation is as follows: Figures 1 to 3 Please provide a detailed explanation. For example... Figure 1 As shown, the duct mainly consists of a flow guide shell 1, a noise reduction layer 2, and a vibration damping frame 3. The flow guide shell 1 is a hollow cylindrical structure with flanges 5 at both ends and a detachable maintenance window 6 in the middle. The noise reduction layer 2 is fixed to the inner wall of the flow guide shell 1 by adhesive bonding and covers the groove area between the flow guide ribs 4. The vibration damping frame 3 is connected to the outer wall of the flow guide shell 1 by snap-fit. An elastic support strip 7 is embedded inside the vibration damping frame 3. The two ends of the elastic support strip 7 contact the outer wall of the flow guide shell 1 and the inner side of the vibration damping frame 3, respectively, forming a complete assembly structure.

[0015] The inner wall of the airflow guide housing 1 is provided with spiral guide ribs 4, which are evenly distributed along the airflow direction. Their cross-section is arc-shaped, and the curvature is designed according to the airflow velocity to reduce turbulence. The height of the guide ribs 4 gradually decreases from the inlet end to the outlet end of the duct. This design adapts to the changing airflow velocity and reduces airflow resistance. Figure 2 As shown, the noise reduction layer 2 covers the grooved area between the guide ribs 4, and its thickness is gradually distributed, being thicker near the duct inlet and thinner near the duct outlet. The noise reduction layer 2 is made of porous sound-absorbing material with micropores on its surface. The diameter of the micropores ranges from 0.5 mm to 1 mm, the spacing between the micropores is 2 mm to 3 mm, and the micropores are arranged in a staggered pattern. The back of the noise reduction layer 2 has a grid-like reinforcing rib, with a thickness of 0.8 mm to 1.2 mm, to enhance the overall strength of the noise reduction layer 2 and prevent collapse during long-term use.

[0016] The outer side of the vibration damping frame 3 is provided with several mounting lugs 8, which are fixed to preset mounting points on the vehicle body by screws. A rubber gasket 9, 3mm to 5mm thick, is provided between the mounting lugs 8 and the vehicle body to isolate the impact of vehicle body vibration on the air duct. The inner side of the vibration damping frame 3 is provided with several protruding limiting blocks, with a gap of 1mm to 2mm between the limiting blocks and the outer wall of the guide housing 1 to prevent structural deformation caused by thermal expansion and contraction from affecting assembly accuracy. Figure 3As shown, the number of elastic support strips 7 is evenly distributed according to the length of the duct. The cross-section of each elastic support strip 7 is elliptical, and its major axis is parallel to the axis of the duct to improve bending resistance and optimize vibration absorption. The two ends of the elastic support strip 7 are in contact with the outer wall of the guide shell 1 and the inner side of the vibration damping frame 3, respectively. The contact parts are precision machined to ensure tight assembly.

[0017] Flanges 5 are located at both ends of the air guide housing 1 and are bolted to the air outlet and air inlet of the automotive air conditioning system. A sealing ring 10, made of silicone, is located inside the flange 5 to prevent airflow leakage and further reduce noise. The access window 6 is connected to the air guide housing 1 via a hinge and is closed using a magnetic closure. The design of the access window 6 facilitates cleaning and maintenance of the duct interior while ensuring the overall structural airtightness. When cleaning is required, operators can enter the duct by opening the access window 6, complete the cleaning, and then close the access window 6, with the magnetic closure ensuring a secure closure.

[0018] In actual operation, airflow enters the guide housing 1 from the duct inlet and moves along the stable flow path formed by the guide ribs 4. The arc design of the guide ribs 4 reduces turbulence within the guide housing 1, making the airflow smoother. As the airflow moves from the inlet to the outlet, the height of the guide ribs 4 gradually decreases, adapting to the changing airflow velocity and thus reducing airflow resistance. The porous structure of the noise reduction layer 2 effectively absorbs mid-to-high frequency noise generated by airflow impact. The staggered distribution of micropores on its surface improves noise absorption efficiency while preventing airflow blockage. The noise reduction layer 2 is thicker near the duct inlet to absorb noise generated by the initial airflow impact; the noise reduction layer 2 is thinner near the duct outlet to ensure smooth airflow discharge.

[0019] The vibration damping frame 3 and its internal elastic support strip 7 significantly reduce the impact of external vibrations on the duct. When vibrations occur during vehicle operation, the vibration damping frame 3 disperses the vibration energy through the elastic support strip 7, reducing the possibility of vibration transmission to the air guide housing 1. The rubber gasket 9 between the mounting ear plate 8 and the vehicle body further isolates the impact of vehicle body vibrations on the duct, thereby improving the overall noise reduction effect. The 1mm to 2mm gap design between the limiting block and the outer wall of the air guide housing 1 effectively avoids structural deformation caused by thermal expansion and contraction, ensuring assembly accuracy.

[0020] During installation, the two ends of the air guide housing 1 are first fixed to the air outlet and air inlet of the automotive air conditioning system using flanges 5. The sealing ring 10 on the inner side of the flange 5 ensures the airflow seal and prevents airflow leakage that could cause noise. Then, the vibration damping frame 3 is connected to the outer wall of the air guide housing 1 using clips, ensuring that the two ends of the elastic support strip 7 are in close contact with the outer wall of the air guide housing 1 and the inner side of the vibration damping frame 3. Finally, the mounting ears 8 of the vibration damping frame 3 are fixed to the pre-set mounting points on the vehicle body using screws. The rubber gasket 9 between the mounting ears 8 and the vehicle body serves to isolate vibration. The entire installation process is simple and convenient, and the modular design makes manufacturing and installation more efficient.

[0021] During use, airflow enters the duct from the inlet and moves along the stable flow path formed by the guide ribs 4. The noise reduction layer 2 absorbs the mid-to-high frequency noise generated by the airflow impact, the vibration damping frame 3 and its internal elastic support strips 7 disperse vibration energy, and the combined use of the flange 5 and sealing ring 10 ensures the airflow sealing, thus achieving a highly efficient noise reduction effect. The design of the inspection window 6 makes cleaning and maintenance of the duct interior more convenient and extends its service life.

[0022] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of its implementation principle is provided in conjunction with specific application scenarios.

[0023] First, after the car's air conditioning system is started, the air conditioning compressor delivers refrigerant gas through pipes to the evaporator, and then cool air is delivered into the passenger compartment through the ductwork. At this time, the airflow enters from the inlet end of the guide housing 1, such as... Figure 1 As shown, the spiral guide ribs 4 inside the guide housing 1 begin to function. The guide ribs 4 are evenly distributed along the airflow direction, and their cross-section is arc-shaped. This structure effectively guides the airflow to form a stable flow path. Since the height of the guide ribs 4 gradually decreases from the inlet end to the outlet end, the airflow naturally adapts to the height change of the guide ribs 4 as its velocity changes, thereby reducing turbulence. This design not only reduces airflow resistance but also reduces noise generated by airflow turbulence.

[0024] Secondly, the noise reduction layer 2 covers the grooved area between the guide ribs 4, and its thickness gradually decreases from the inlet end to the outlet end, such as... Figure 2As shown. When airflow impacts the inner wall of the guide housing 1, the micropores on the surface of the porous sound-absorbing material of the noise reduction layer 2 begin to absorb the mid-to-high frequency noise generated by the airflow impact. These micropores have a diameter ranging from 0.5mm to 1mm, a spacing of 2mm to 3mm, and are arranged in a staggered pattern. This design can improve noise absorption efficiency while ensuring smooth airflow. The noise reduction layer 2 near the duct inlet is thicker, mainly absorbing the larger noise generated by the initial airflow impact; while the noise reduction layer 2 near the duct outlet is thinner, ensuring that the airflow can be smoothly discharged and avoiding airflow blockage due to excessive thickness of the noise reduction layer. In addition, the grid-like reinforcing ribs on the back of the noise reduction layer 2 further enhance its overall strength, preventing collapse during long-term use and ensuring the durability of the noise reduction effect.

[0025] Furthermore, when vibrations occur during vehicle operation, the damping frame 3 and its internal elastic support bars 7 begin to function, such as... Figure 3 As shown, the vibration damping frame 3 is connected to the outer wall of the air guide housing 1 via clips. Multiple elastic support bars 7 with elliptical cross-sections are embedded inside. The long axis of these elastic support bars 7 is parallel to the air duct axis, effectively dispersing vibration energy. When vehicle vibration is transmitted to the vibration damping frame 3, the two ends of the elastic support bars 7 contact the outer wall of the air guide housing 1 and the inner side of the vibration damping frame 3 respectively, absorbing vibration energy through elastic deformation, thereby reducing the possibility of vibration being transmitted to the air guide housing 1. Simultaneously, the mounting ear plates 8 on the outer side of the vibration damping frame 3 are fixed to the preset mounting points on the vehicle body with screws. Rubber gaskets 9, with a thickness of 3mm to 5mm, are provided between the mounting ear plates 8 and the vehicle body, further isolating the impact of vehicle vibration on the air duct. A gap of 1mm to 2mm is left between the limiting block on the inner side of the vibration damping frame 3 and the outer wall of the air guide housing 1. This design effectively avoids structural deformation caused by thermal expansion and contraction, ensuring assembly accuracy.

[0026] Next, flanges 5 are installed at both ends of the air guide housing 1 and fixed to the air outlet and air inlet of the automotive air conditioning system with bolts. The sealing ring 10 inside the flange 5 is made of silicone, which can effectively prevent airflow leakage. The design of the sealing ring 10 not only improves the airflow sealing performance but also further reduces noise caused by airflow leakage. The access window 6 is connected to the air guide housing 1 by hinges and is closed by a magnetic attraction device. When it is necessary to clean or maintain the inside of the duct, the operator can enter the duct by opening the access window 6, and after cleaning, close the access window 6. The magnetic attraction device ensures that it is firmly closed, thereby ensuring the overall structural sealing performance.

[0027] Finally, throughout the entire duct operation, all components work together to achieve efficient noise reduction. After entering from the inlet end of the guide shell 1, the airflow moves along the stable flow path formed by the guide ribs 4, reducing turbulence. The noise reduction layer 2 absorbs mid-to-high frequency noise generated by airflow impact through its porous structure. The vibration damping frame 3 and its internal elastic support strips 7 disperse external vibration energy, reducing noise transmission caused by vibration. The combined use of the flange 5 and sealing ring 10 further ensures the airflow's sealing performance. The design of the inspection window 6 makes cleaning and maintenance of the duct interior more convenient, extending its service life.

[0028] In summary, this invention achieves effective noise control of automotive air conditioning ducts through the combined design of the airflow guide shell 1, noise reduction layer 2, and vibration damping frame 3. The airflow guide ribs 4 optimize the airflow path, the noise reduction layer 2 efficiently absorbs mid-to-high frequency noise, and the vibration damping frame 3 and its internal elastic support strips 7 significantly reduce the impact of external vibrations on the duct, thereby improving the overall noise reduction effect. This design not only meets users' needs for a quiet environment but also takes into account the compactness and lightweight requirements of the duct, demonstrating high practicality and economy.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A car air conditioning duct with a noise reduction structure, characterized in that, The duct includes a flow guide shell (1), a noise reduction layer (2) set on the inner wall of the flow guide shell (1), and a vibration damping frame (3) fixed on the outer side of the flow guide shell (1). The flow guide shell (1) is a hollow cylindrical structure with spiral flow guide ribs (4) on its inner wall. The noise reduction layer (2) covers the groove area between the flow guide ribs (4). The vibration damping frame (3) has an elastic support strip (7) embedded inside.

2. The automotive air conditioning duct with noise reduction structure according to claim 1, characterized in that: The flow guide housing (1) is provided with flanges (5) at both ends, and a sealing ring (10) is provided inside the flange (5). The sealing ring (10) is made of silicone.

3. The automotive air conditioning duct with noise reduction structure according to claim 1, characterized in that: The flow guide housing (1) has a detachable maintenance window (6) in the middle. The maintenance window (6) is connected to the flow guide housing (1) by a hinge and is closed by a magnetic attraction device.

4. The automotive air conditioning duct with noise reduction structure according to claim 1, characterized in that: The noise reduction layer (2) is made of porous sound-absorbing material. Its surface has a number of micropores with a diameter ranging from 0.5 mm to 1 mm and a spacing of 2 mm to 3 mm. The micropores are arranged in an alternating pattern. The back of the noise reduction layer (2) has a grid-like reinforcing rib with a thickness of 0.8 mm to 1.2 mm.

5. The automotive air conditioning duct with noise reduction structure according to claim 1, characterized in that: The outer side of the damping frame (3) is provided with several mounting ear plates (8), and a rubber pad (9) is provided between the mounting ear plate (8) and the vehicle body. The thickness of the rubber pad (9) is 3 mm to 5 mm. The inner side of the damping frame (3) is provided with several protruding limiting blocks, and a gap of 1 mm to 2 mm is left between the limiting blocks and the outer wall of the guide housing (1).

6. The automotive air conditioning duct with noise reduction structure according to claim 1, characterized in that: The cross-section of the guide rib (4) is arc-shaped. The height of the guide rib (4) gradually decreases from the inlet end to the outlet end of the air duct. The guide rib (4) is equidistantly distributed along the airflow direction.

7. The automotive air conditioning duct with noise reduction structure according to claim 1, characterized in that: The number of elastic support strips (7) is evenly distributed according to the length of the duct. The cross-section of each elastic support strip (7) is elliptical, and its major axis is parallel to the axis of the duct.

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