High-supporting-rigidity seat ventilation system based on topological air duct structure

Abstract

The invention provides a high-supporting-rigidity seat ventilation system based on a topological air duct structure, and belongs to the technical field of automobile seat ventilation structures. Comprising a seat framework, a ventilation fan, a topological air duct integrated foaming structure and a multi-level gradient composite foaming material, wherein the ventilation fan is fixedly arranged on the bent part mounting surface of the seat framework; the topological air duct integrated foaming structure comprises a main air duct and a plurality of branch air ducts, the main air duct is arranged in a secondary pressure-bearing area in the seat framework, the branch air ducts are connected with the main air duct, and a plurality of air outlet holes are formed in long edge sections of the branch air ducts; the topological air duct integrated foaming structure is wrapped by the multi-level gradient composite foaming material, and air flow at the air outlet holes is evenly distributed and diffused through the pore structure of the multi-level gradient composite foaming material. The ventilation efficiency can be improved on the basis that the high supporting rigidity of the seat is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of automotive seat ventilation structure technology, and particularly relates to a high-support rigidity seat ventilation system based on a topological air duct structure. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] As the automotive market increasingly demands higher levels of passenger comfort, seat ventilation systems have gradually become a core feature in mid-to-high-end vehicles. By actively circulating airflow, they reduce the temperature and humidity of the surfaces in contact with the seat, significantly alleviating the stuffiness experienced during long journeys. Currently, OEMs and suppliers are continuously increasing their investment in ventilation technology, driving rapid iteration in this field.

[0004] Currently, mainstream solutions generally adopt active air supply systems, which use centrifugal fans to drive airflow through air guide layers and air distribution plates to diffuse it onto the seat surface. In terms of materials, multi-layer composite structures (such as a combination of ventilation cotton and air guide nets) are being used to balance breathability and durability. Gradient density foaming technology (high density on the surface and low density at the bottom) combined with a serpentine air duct design has become a commonly used design.

[0005] However, existing technologies still face many insurmountable technical bottlenecks, such as: (1) The contradiction between support stiffness and ventilation efficiency is prominent. In order to increase the ventilation volume, the open area ratio of the foam material or the cross-sectional area of ​​the air duct needs to be increased, but this will destroy the continuity of the foam structure. Especially when the air duct is arranged in the main load-bearing areas such as the buttocks, the local support stiffness will be significantly reduced. If the open area ratio or air duct size is reduced in order to ensure support, the ventilation volume will be difficult to meet the requirements.

[0006] (2) Insufficient structural stability. Some existing solutions shorten the duct length and increase the air velocity by reducing the thickness of the foam below the hip. Although this design can temporarily enhance the ventilation effect, it is prone to weakening of support due to material fatigue after long-term use, and may even lead to collapse.

[0007] (3) The challenge of balancing performance and reliability. When the ventilation volume is large, the vibration amplitude of the seat will increase, which will affect the riding experience; at the same time, the air permeability of the foam material will decrease after a long period of use, resulting in a continuous decline in ventilation effect. In addition, traditional air duct designs (such as straight-through and simple branch structures) are prone to problems such as uneven airflow distribution, excessively high wind speed in local areas or the formation of airflow dead zones, and obvious noise accompanying the operation of the fan.

[0008] In summary, existing seat ventilation systems still have significant shortcomings in the synergistic optimization of support stiffness, ventilation efficiency, structural durability, and user experience. There is an urgent need for a technical solution that can ensure high ventilation efficiency while also taking into account the support performance of key areas of the seat. Summary of the Invention

[0009] To overcome the shortcomings of the prior art, the present invention provides a high-support stiffness seat ventilation system based on a topological air duct structure, which can improve ventilation efficiency while ensuring high support stiffness of the seat.

[0010] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions: The first aspect of the present invention provides a high-support rigidity seat ventilation system based on a topological air duct structure.

[0011] A high-support stiffness seat ventilation system based on a topological air duct structure includes: a seat frame, a ventilation fan, a topological air duct integrated foam structure, and a multi-level gradient composite foam material; The ventilation fan is fixed at a preset tilt angle to the bending mounting surface of the seat frame and is used to deliver air to the topological air duct integrated foam structure. The topological air duct integrated foam structure includes a main air duct and multiple branch air ducts; wherein, the main air duct is located in the secondary pressure-bearing area inside the seat frame, and the branch air ducts are vertically connected to the main air duct in an L-shape, and multiple air outlets of equal diameter are opened on the long side section. The multi-level gradient composite foaming material encapsulates the topological air duct integrated foaming structure, and the airflow at each air outlet achieves uniform distribution and diffusion through the pore structure of the multi-level gradient composite foaming material.

[0012] Furthermore, the multi-layered gradient composite foam material includes a surface layer, a middle layer, and a bottom layer; wherein, the surface layer is a high-density polymer layer used to form a rigid support interface; the middle layer is a microporous breathable layer connected to each branch air duct; and the bottom layer is a honeycomb sound-absorbing layer attached to the surface of the seat frame.

[0013] Furthermore, the multi-level gradient composite foam material forms annular reinforcing ribs around the main ventilation duct and multiple branch ventilation ducts through a local density enhancement design.

[0014] Furthermore, the density of the high-density polymer layer is higher than that of the microporous breathable layer, and the porosity of the microporous breathable layer is greater than that of the honeycomb sound-absorbing layer; the density of the local density-enhancing region of the multi-level gradient composite foam material is higher than that of the high-density polymer layer.

[0015] Furthermore, the long side sections of the multiple branch air ducts extend vertically to the seat cushion contact surface, and their air outlets are evenly distributed.

[0016] Furthermore, a high-stiffness seat ventilation system based on a topological duct structure also includes an electronic control unit and a distributed temperature sensor network composed of a flexible thin-film temperature sensor array; wherein, the distributed temperature sensor network is embedded in the surface layer of a multi-layer gradient composite foam material, and the electronic control unit controls the opening of the rotary variable cross-section damper by receiving signals from the distributed temperature sensor network in real time.

[0017] Furthermore, the number of the rotating variable cross-section dampers is the same as the number of air outlets, that is, a rotating variable cross-section damper is provided below each air outlet.

[0018] Furthermore, the rotating variable cross-section damper includes a multi-stage fan-shaped blade group nested coaxially, and the opening adjustment range of each stage of the blade is driven by an independent stepper motor.

[0019] Furthermore, the inner wall of the main ventilation duct has a corrugated flow guiding structure, and the end of the branch duct is provided with a tapered flow guiding port.

[0020] Furthermore, the main ventilation duct is located in the secondary pressure-bearing area inside the seat frame, that is: the topological air duct integrated foaming structure is integrally formed with the seat frame through in-mold foaming process, and the main ventilation duct is located inside the seat frame load-bearing beam.

[0021] The above one or more technical solutions have the following beneficial effects: (1) This invention adopts a topological air duct layout, placing the main ventilation duct in the secondary pressure-bearing area of ​​the seat, avoiding the main load-bearing areas such as the buttocks, which can prevent the air duct from damaging the structural integrity of the main stress-bearing parts; at the same time, the surface of the multi-layer gradient composite foam material is formed by high-density polymer to form a rigid support interface, and the periphery of the main air duct and the branch air ducts are reinforced with local density to form ring-shaped reinforcing ribs, so as to further enhance the rigidity of the surrounding structure of the air duct. The above design can ensure the ventilation volume through the reasonable size and layout of the main air duct and the L-shaped branch air duct, and can also ensure that the support rigidity of the main load-bearing area of ​​the seat is not weakened by relying on the air duct setting in the secondary pressure-bearing area, the high-density surface material, and the ring-shaped reinforcing ribs, effectively solving the contradiction of "increasing the ventilation volume reduces the support, and ensuring the support sacrifices the ventilation volume".

[0022] (2) This invention utilizes a topological air duct spatial layout (the main air duct is embedded inside the seat frame support beam, and the branch air ducts extend vertically to the seat cushion contact surface) and the synergistic effect of multi-level gradient composite foam materials (the surface high-density polymer directly supports the pressure, and the bottom honeycomb sound-absorbing layer forms a mechanical coupling with the frame) to ensure efficient ventilation while maintaining the overall thickness and structural integrity of the foam material. Combined with the ring-shaped reinforcing ribs around the air duct to enhance local stiffness, it effectively resists material fatigue during long-term use, avoids weakening of support and collapse caused by foam thinning, and significantly improves the structural stability and service life of the system.

[0023] (3) The inner wall of the main air duct of the present invention adopts a corrugated air guiding structure, and the end of the branch air duct is provided with a tapered air guiding port. With the uniform layout of the L-shaped branch air duct, the uneven airflow, local overload or dead zone problems of traditional straight or simple branch structures can be avoided, and the airflow is uniformly diffused on the surface of the seat. At the same time, the bottom honeycomb sound-absorbing layer can dissipate sound wave energy through special pore structure, reducing the noise of fan operation and frame vibration; the ventilation fan is fixed to the frame bending part at a preset tilt angle, which can reduce the vibration caused by airflow turbulence while expanding the air intake range, thereby solving the noise and vibration problems associated with high ventilation volume. In addition, the gradient density design of the multi-level gradient composite foam material (high density on the surface to resist compression, and microporous structure in the middle layer to resist clogging) can delay the decay of air permeability; combined with the intelligent control of distributed temperature sensors and rotating variable cross-section dampers (increasing the damper cross-section in the high temperature zone and decreasing it in the low temperature zone), the waste of airflow and the material aging caused by local excessive air supply can be avoided, further ensuring the stability of ventilation effect in long-term use.

[0024] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] Figure 1 This is a schematic diagram of the seat ventilation system with a topological air duct structure in Embodiment 1 of the present invention.

[0027] Figure 2 This is a schematic diagram of the numerical analysis results of a foamed seat cushion with ventilation holes based on a traditional cylindrical air duct structure in the prior art.

[0028] Figure 3 This is a schematic diagram of the numerical analysis results of foamed seat cushions designed based on traditional thinning methods in the prior art.

[0029] Figure 4 This is a schematic diagram of a seat ventilation system based on a traditional cylindrical air duct structure in the prior art.

[0030] Figure 5 This is a structural diagram of the ventilation holes in the seat cushion in Embodiment 1 of the present invention.

[0031] Figure 6 This is a comparative diagram of the ventilation fans of different seat cushion ventilation systems in Embodiment 1 of the present invention.

[0032] In the diagram: 1. Seat frame; 2. Ventilation fan; 3. Topological air duct integrated foam structure; 31. Main ventilation duct; 32. Branch air duct; 4. Secondary pressure zone; 5. Main pressure zone; 6. Ventilation hole. Detailed Implementation

[0033] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0035] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0036] Example 1 This embodiment discloses a high-support rigidity seat ventilation system based on a topological duct structure.

[0037] A high-support stiffness seat ventilation system based on a topological air duct structure includes: a seat frame, a ventilation fan, a topological air duct integrated foam structure, and a multi-level gradient composite foam material; The ventilation fan is fixed at a preset tilt angle to the bending mounting surface of the seat frame and is used to deliver air to the topological air duct integrated foam structure. The topological air duct integrated foam structure includes a main air duct and multiple branch air ducts; wherein, the main air duct is located in the secondary pressure-bearing area inside the seat frame, and the branch air ducts are vertically connected to the main air duct in an L-shape, and multiple air outlets of equal diameter are opened on the long side section. The multi-level gradient composite foaming material encapsulates the topological air duct integrated foaming structure, and the airflow at each air outlet achieves uniform distribution and diffusion through the pore structure of the multi-level gradient composite foaming material.

[0038] Based on the above-described systematic structural design, this invention can improve ventilation efficiency while ensuring high seat support rigidity. To facilitate understanding of the technical solution of this invention, the specific implementation methods of this invention will be further explained and described below.

[0039] like Figure 1 As shown, a high-support stiffness seat ventilation system based on a topological air duct structure includes: a seat frame 1, a ventilation fan 2, a topological air duct integrated foam structure 3, and a multi-layered gradient composite foam material. Through innovative structural design and material optimization, this seat ventilation system can significantly enhance the support performance of key areas of the seat while ensuring sufficient airflow exchange.

[0040] like Figure 6 As shown, the seat ventilation system employs a space-optimized airflow channel layout, integrating the ventilation device into a specific geometric position within the seat frame. Utilizing the frame's own shape to guide airflow, it effectively reduces airflow energy loss. Specifically, the seat cushion's ventilation fan 2... The tilt angle is fixed to the mounting surface of the bent part of the seat frame, which can better ensure the strength of the seat compared to the existing design that places the fan at the bottom of the seat frame.

[0041] like Figure 5 As shown, the ventilation hole 6 is located at the front of the inner foam and is used to supply air to the topological duct integrated foam structure.

[0042] like Figure 2 , Figure 3 As shown, existing technologies using cylindrical ventilation structures or methods that reduce the thickness of the seat cushion for ventilation will eventually cause the cushion to deform. For example... Figure 1 As shown, the ventilation duct 3 within the foam of this invention adopts a biomimetic fractal airflow guiding structure. The main ventilation duct 31 unfolds in stages into multiple branch ducts 32 in a multi-layered branch network. Uniform airflow distribution is achieved through fluid dynamics optimization. The air outlet path is located in the secondary pressure-bearing area 4 of the cushion, avoiding the main pressure-bearing area 5 to maintain structural integrity. Specifically, as shown... Figure 4 As shown. The high-load-bearing area of ​​the foam has been modified very little. Compared to traditional seat ventilation system designs, the ventilation system structure of this invention provides improved support stiffness for the buttocks. Specifically, the topological air duct integrated foam structure includes a main ventilation duct and multiple branch air ducts; wherein, the main ventilation duct is located in the secondary pressure-bearing area (vertical projection area of ​​the midpoint of the standard human thigh line) inside the seat frame, that is: the topological air duct integrated foam structure is integrally formed with the seat frame through an in-mold foaming process; and, the main ventilation duct is located inside the seat frame load-bearing beam, seamlessly integrated with the surface rigid interface through an in-mold foaming process. The branch air ducts are L-shaped and vertically connected to the main ventilation duct, with multiple equal-diameter air outlets opened on the long side.

[0043] As an optional embodiment, the main ventilation duct adopts an axial channel with a diameter of 10mm, extending into L-shaped branch ducts. The long side of each branch duct has vertically upward-facing air outlets of equal diameter. The long sides of multiple branch ducts extend vertically to the seat cushion contact surface, with their air outlets evenly spaced. The branch ducts are embedded in a mid-layer microporous structure, utilizing the inherent porosity of the material to form distributed micro-airflow channels. Under dynamic load conditions, the annular reinforcing ribs formed by secondary foaming in the peripheral area complement the frame beams mechanically, maintaining the integrity of the duct structure while avoiding fatigue damage caused by stress concentration. This strengthens the duct structure while preventing stress concentration caused by abrupt changes in stiffness. In the final seat structure, the duct reinforcing ribs and the frame load-bearing beams complement each other mechanically, exhibiting excellent bending resistance in dynamic load tests.

[0044] A multi-layered gradient composite foam material is used to encapsulate the topological air duct integrated foam structure. Airflow at each outlet is uniformly distributed and diffused through the pore structure of the multi-layered gradient composite foam material. The multi-layered gradient composite foam material employs a multi-layered composite design, including a surface layer, a middle layer, and a bottom layer. The surface layer is a high-density polymer layer, forming a rigid support interface that directly adheres to the human body contact surface, providing stable support performance. The middle layer is a microporous breathable layer, connected to each branch air duct, and forms a honeycomb pore structure through controlled foaming technology. The bottom layer is a honeycomb sound-absorbing layer, adhered to the seat frame surface, and enhances sound wave dissipation through a special pore structure. As an optional embodiment, the special pore structure is a honeycomb pore structure adapted to sound wave dissipation requirements. Meanwhile, the multi-level gradient composite foam material forms ring-shaped reinforcing ribs around the main ventilation duct and multiple branch ducts through a local secondary foaming process. In the actual design process, the density of the high-density polymer layer is higher than that of the microporous breathable layer, and the porosity of the microporous breathable layer is greater than that of the honeycomb sound-absorbing layer; the density of the local density-enhancing areas of the multi-level gradient composite foam material is higher than that of the high-density polymer layer. During the molding process, the foam material combines with the pre-placed flow channel template inside the seat frame through a directional expansion process to form a continuous topological air channel network. During the foaming process, the directional expansion process causes the material density to show a continuous gradient change, achieving a smooth transition of acoustic impedance and effectively blocking the vibration transmission path.

[0045] A high-support rigidity seat ventilation system based on a topological duct structure also includes an electronic control unit and a distributed temperature sensor network composed of a flexible thin-film temperature sensor array; wherein, the distributed temperature sensor network is embedded in the surface layer of a multi-level gradient composite foam material, and the electronic control unit controls the opening of the rotary variable cross-section damper by receiving signals from the distributed temperature sensor network in real time.

[0046] Specifically, the number of rotating variable cross-section dampers matches the number of air outlets; that is, one rotating variable cross-section damper is installed below each air outlet. Each rotating variable cross-section damper comprises coaxially nested multi-stage fan-shaped blade groups. The opening adjustment range of each stage of blades is driven by an independent stepper motor. Specifically, the opening adjustment range of each stage of blades is... to These correspond to the continuous adjustment of the effective flow area of ​​the air outlet from fully closed to maximum opening. After receiving the temperature distribution signal on the seat cushion, the vehicle control module adjusts the rotating variable cross-section damper according to the temperature, making the damper cross-section larger in high-temperature areas and smaller in low-temperature areas. Specifically, the vehicle electronic control unit collects the temperature sensor signals of each zone in real time through the CAN bus and generates a PWM pulse width modulation signal according to the preset temperature-flow coupling algorithm. That is, when the detected temperature of a certain area is higher than the set threshold, the corresponding air guiding mechanism performs an angle increment adjustment, which increases the flow cross-sectional area according to the Navier-Stokes equation, thereby increasing the volumetric flow rate of the cooling airflow. Ultimately, this achieves an intelligent gradient air supply control strategy based on non-uniform volume pressure distribution. The relationship between the volumetric flow rate and temperature of each air duct changes based on the following equation: ; in, For volumetric flow rate, For temperature source terms; This indicates the airflow temperature or the temperature of the seat contact surface. Indicates the speed of airflow within the duct. This indicates the density of the airflow within the duct. This represents a specific gas constant for air. This indicates the pressure of the airflow inside the duct.

[0047] The inner wall of the main ventilation duct has a corrugated airflow guiding structure, while the ends of the branch ducts are equipped with tapered airflow guides to further optimize airflow guiding efficiency.

[0048] The structure-function integrated design of the seat ventilation system in this invention ensures the synergistic optimization of ventilation efficiency and structural rigidity by strictly defining the spatial topological relationship between the main air duct and branch air ducts. Specifically: 1) This invention's innovative topological airflow layout overcomes the limitations of existing technologies. By placing the main ventilation duct in the secondary pressure-bearing area of ​​the seat and combining it with the three-dimensional extension of L-shaped branch air ducts, a highly efficient airflow network is formed while maintaining the overall rigidity of the seat. This topological airflow design allows airflow to penetrate evenly to the contact surface along a predetermined path, avoiding localized airflow overload or dead zones. Practical application tests show that this design significantly improves the uniformity of airflow coverage on the seat surface, fundamentally improving user comfort, especially effectively reducing discomfort caused by heat and humidity during long-term seating.

[0049] 2) This invention achieves precise real-time monitoring of the temperature field of the human body contact surface by employing a distributed curved surface bonding installation scheme using flexible thin-film temperature sensors. Combined with the dynamic response mechanism of the rotating variable cross-section damper, the seat ventilation system can accurately distribute airflow according to the actual temperature differences in different areas of the seat cushion surface. When a local temperature rise is detected, the cross-section of the damper in the corresponding area automatically increases to improve the efficiency of cold air delivery, while the low-temperature area maintains a smaller opening to avoid excessive cooling. This targeted temperature control adjustment effectively shortens the heat accumulation time in high-temperature areas while maintaining overall comfort, and improves the cooling rate through fluid dynamics optimization. Furthermore, due to the collaborative design of the flexible sensor and the rotating damper, the interference of traditional rigid sensors on body pressure distribution is avoided, and the temperature gradient difference of the contact surface can be converged to within seconds (typically 3 seconds). Within this range, compared to similar systems with fixed damper structures, the response time for human body temperature regulation can be significantly shortened, improving energy utilization. Especially in high-temperature environments in summer, the seat surface temperature can be reduced from 45°C to the comfort threshold of 32°C within 120 seconds.

[0050] 3) The multi-layered gradient composite foam material design of this application can effectively disperse concentrated loads while maintaining continuous airflow exchange capacity. The foam material uses composite materials, with a high-density polymer on the surface, a permeable geotextile in the middle layer to balance air permeability requirements, and a honeycomb structure in the bottom layer to dissipate sound energy. The synergistic structure of the multi-layered gradient composite foam material, with a high-density polymer on the surface forming a rigid support interface, a microporous permeable geotextile in the middle layer achieving the dual functions of air permeability and pressure dispersion, and a bottom honeycomb sound-absorbing foam layer that absorbs noise from the fan while reducing vibration noise between the seat frame and the foam, ensures the synergistic optimization of ventilation efficiency and structural stiffness by locally increasing density to the periphery of the air duct and strictly defining the spatial topology and dimensional parameters of the main air duct and branch air ducts.

[0051] In summary, the technical solution of this invention achieves directional control of airflow path and gradient matching of material mechanical properties while maintaining the high support performance of the seat, effectively solving the technical contradiction between the mutual constraint of support stiffness and breathability in traditional ventilated seats.

[0052] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A high-support rigidity seat ventilation system based on a topological duct structure, characterized in that, include: Seat frame, ventilation fan, topological air duct integrated foam structure and multi-level gradient composite foam material; The ventilation fan is fixed at a preset tilt angle to the bending mounting surface of the seat frame and is used to deliver air to the topological air duct integrated foam structure. The topological air duct integrated foam structure includes a main air duct and multiple branch air ducts; wherein, the main air duct is located in the secondary pressure-bearing area inside the seat frame, and the branch air ducts are vertically connected to the main air duct in an L-shape, and multiple air outlets of equal diameter are opened on the long side section. The multi-level gradient composite foaming material encapsulates the topological air duct integrated foaming structure, and the airflow at each air outlet achieves uniform distribution and diffusion through the pore structure of the multi-level gradient composite foaming material.

2. The high-support rigidity seat ventilation system based on a topological duct structure as described in claim 1, characterized in that, The multi-layered gradient composite foam material includes a surface layer, a middle layer, and a bottom layer; wherein, the surface layer is a high-density polymer layer used to form a rigid support interface; the middle layer is a microporous breathable layer that communicates with each branch air duct; and the bottom layer is a honeycomb sound-absorbing layer that is attached to the surface of the seat frame.

3. The high-support rigidity seat ventilation system based on a topological duct structure as described in claim 1, characterized in that, The multi-level gradient composite foam material forms ring-shaped reinforcing ribs around the main ventilation duct and multiple branch ventilation ducts through a local density enhancement design.

4. A high-stiffness seat ventilation system based on a topological duct structure as described in any one of claims 2-3, characterized in that, The density of the high-density polymer layer is higher than that of the microporous breathable layer, and the porosity of the microporous breathable layer is greater than that of the honeycomb sound-absorbing layer; the density of the local density-enhancing region of the multi-level gradient composite foam material is higher than that of the high-density polymer layer.

5. A high-support rigidity seat ventilation system based on a topological duct structure as described in claim 1, characterized in that, The long side sections of the multiple branch air ducts extend vertically to the seat cushion contact surface, and their air outlets are evenly distributed.

6. The high-support rigidity seat ventilation system based on a topological duct structure as described in claim 1, characterized in that, It also includes an electronic control unit and a distributed temperature sensor network consisting of a flexible thin-film temperature sensor array; wherein the distributed temperature sensor network is embedded in the surface layer of the multi-layer gradient composite foam material, and the electronic control unit controls the opening of the rotary variable cross-section damper by receiving signals from the distributed temperature sensor network in real time.

7. A high-support rigidity seat ventilation system based on a topological duct structure as described in claim 6, characterized in that, The number of rotating variable cross-section dampers is the same as the number of air outlets, that is, a rotating variable cross-section damper is provided below each air outlet.

8. A high-support rigidity seat ventilation system based on a topological duct structure as described in claim 7, characterized in that, The rotating variable cross-section damper includes a multi-stage fan-shaped blade group nested on the same axis, and the opening adjustment range of each stage of the blade is driven by an independent stepper motor.

9. A high-support rigidity seat ventilation system based on a topological duct structure as described in claim 1, characterized in that, The inner wall of the main ventilation duct has a corrugated flow guiding structure, and the end of the branch duct is provided with a tapered flow guiding port.

10. A high-support rigidity seat ventilation system based on a topological duct structure as described in claim 1, characterized in that, The main ventilation duct is located in the secondary pressure-bearing area inside the seat frame. That is, the topological air duct integrated foam structure is integrally formed with the seat frame through in-mold foaming process, and the main ventilation duct is located inside the load-bearing beam of the seat frame.

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