Automobile heat-insulation and sound-insulation pad and use method thereof

Abstract

The invention relates to the technical field of automobile parts, in particular to an automobile heat insulation-sound insulation pad and a using method thereof.The automobile heat insulation-sound insulation pad is characterized in that protruding structures are distributed in the length direction of a wear-resisting layer, groove structures are distributed in the length direction of a sound absorption layer, and the groove structures and the protruding structures are embedded; the temperature-sensitive filling material is arranged in the embedding gap between the convex structure and the groove structure, so that the self-adaptive adjustment of the interlayer connection rigidity and flexibility is realized, and the connection reliability is ensured while the thermal stress is released through the temperature response type mechanical locking structure; according to the using method of the automobile heat insulation-sound insulation pad, due to the fact that the temperature-sensitive filling material deforms according to the temperature change in the automobile, the phase change layer absorbs heat when the temperature in the automobile rises to the phase change temperature and releases heat when the temperature in the automobile drops below the phase change temperature, and the temperature-sensitive filling material adjusts the compression state of the sound absorption layer according to the temperature change; therefore, the sound insulation performance of the sound absorption layer is changed, the driving comfort is improved, and the energy consumption of temperature regulation and control in the vehicle is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of automotive parts, and more particularly to an automotive heat insulation and sound insulation pad and its application method. Background Technology

[0002] Automotive thermal and sound insulation pads, as automotive components that isolate engine noise and heat, play a crucial role in sound insulation, heat insulation, vibration damping, and improving driving comfort. With the continuous improvement of automotive NVH (noise, vibration, and harshness) performance standards, and the increasingly stringent requirements for energy consumption control and thermal management in new energy vehicles, the traditional fixing performance design of thermal and sound insulation pads is no longer sufficient to meet the needs of complex operating conditions. Existing technologies generally suffer from low reliability of interlayer connections and the inability to release thermal stress caused by temperature changes.

[0003] In the prior art, patent publication number CN211942397U discloses an environmentally friendly automotive sound and heat insulation pad, which includes a pad body, an outer sleeve, a zipper on the outer wall of the sleeve, a zipper head at one end, a substrate aluminum foil layer near the zipper end of the pad body, a heat-insulating coating layer on top of the substrate aluminum foil layer, a first non-woven fabric layer on top of the heat-insulating coating layer, an open-cell foam layer on the end of the first non-woven fabric layer away from the heat-insulating coating layer, and a closed-cell foam layer on top of the open-cell foam layer. Although this solution utilizes a plug-in structure to achieve partial detachability, it has the following drawbacks: insufficient reliability of interlayer connections; the slot and plug are rigidly mechanically coupled, which is prone to fretting wear under temperature cycling or mechanical vibration, leading to loose connections; and the plug-in interface is a fixed rigid connection, which cannot effectively release thermal stress through structural deformation, resulting in a high risk of interlayer delamination due to differences in thermal expansion and contraction between layers during temperature changes.

[0004] Patent publication number CN115320510B discloses a heat-insulating and sound-absorbing pad for the front bulkhead of a car cab based on polymer materials. The pad includes a heat-insulating reinforcing plate fixedly connected to the front bulkhead panel of the car cab, a sound-insulating reinforcing plate located on the side where the car engine is located, and a honeycomb panel located between the heat-insulating and sound-insulating reinforcing plates for connecting them. Both sides of the honeycomb panel are connected to the heat-insulating and sound-insulating reinforcing plates by hot-melting with an adhesive. While this solution utilizes a honeycomb structure to improve sound absorption, the interlayer connection method is singular and non-adjustable. The adhesive is prone to aging and failure under high-temperature environments. Furthermore, the bonding interface is fixed, and when temperature changes cause thermal expansion and contraction, the thermal stress cannot be released through the deformation of the connecting structure itself, easily leading to cracking or delamination of the adhesive layer. Summary of the Invention

[0005] The purpose of this invention is to provide an automotive heat insulation and sound insulation pad and its usage method, aiming to solve the problems of insufficient interlayer connection reliability and inability to release thermal stress caused by temperature changes in automotive heat insulation and sound insulation pads.

[0006] According to one aspect of the invention, an automotive heat insulation and sound insulation pad is provided, comprising a wear-resistant layer, a sound-absorbing layer, a temperature-sensitive filler material, and a phase change layer. The bottom surface of the wear-resistant layer has a raised structure distributed along its length. The top surface of the sound-absorbing layer has a grooved structure distributed along its length, and the grooved structure engages with the raised structure. The temperature-sensitive filler material is disposed in the gap between the raised structure and the grooved structure, and contacts both the raised structure and the grooved structure. The phase change layer covers the bottom surface of the sound-absorbing layer. The temperature-sensitive filler material forms a mechanical lock with the raised structure and the grooved structure, and the temperature-sensitive filler material deforms and releases thermal stress through temperature changes. The phase change layer maintains temperature stability through a phase change reaction.

[0007] Furthermore, the temperature-sensitive filler material is shape memory polyurethane or shape memory epoxy resin; the temperature-sensitive filler material is covered by a flexible sealing film, which covers the temperature-sensitive filler material, fills the remaining space of the interlocking gap, and isolates the temperature-sensitive filler material from the external environment.

[0008] Furthermore, the sound-absorbing layer is an open-cell polyurethane foam; the phase change layer includes phase change microcapsules and a thermally conductive network, wherein the phase change microcapsules encapsulate a paraffin-based phase change material; and the thermally conductive network is expanded graphite or carbon fiber mesh.

[0009] Furthermore, the protrusion structure is an arc-shaped protrusion, and the groove structure is an arc-shaped groove that fits into the arc-shaped protrusion.

[0010] Furthermore, both the surface of the protruding structure and the surface of the groove structure are covered with an elastic wear-resistant layer, which is a silicone body.

[0011] Furthermore, it also includes an anti-slip bottom layer and an edge sealing strip. The anti-slip bottom layer is located on the bottom surface of the phase change layer and has a grid-like anti-slip texture and a buffer cavity. The edge sealing strip is arranged around the edge of the wear-resistant layer, the sound-absorbing layer and the phase change layer. The edge sealing strip is a hollow rubber strip and is filled with a water-absorbing and expanding material.

[0012] In another aspect, the present invention provides a method of using an automotive heat insulation and sound insulation mat, applied to the aforementioned automotive heat insulation and sound insulation mat, comprising the following steps:

[0013] S1. Installation: Lay the automotive heat insulation and sound insulation pad on the car floor, so that the phase change layer is in contact with the car floor and the wear-resistant layer faces upward;

[0014] S2. Temperature Adaptive: The temperature-sensitive filling material deforms according to changes in the vehicle interior temperature. When the temperature is below the phase transition temperature, the temperature-sensitive filling material maintains a low-stiffness state, and slight relative slippage is allowed between the protruding structure and the groove structure. When the temperature is above the phase transition temperature, the temperature-sensitive filling material hardens to form a high-stiffness state, and the protruding structure and the groove structure are rigidly engaged.

[0015] S3, Phase change temperature regulation: The phase change layer absorbs heat when the temperature inside the vehicle rises to the phase change temperature, and releases heat when the temperature inside the vehicle drops below the phase change temperature.

[0016] S4. Adaptive sound insulation: The temperature-sensitive filling material adjusts the compression state of the sound-absorbing layer according to temperature changes to change the sound insulation performance of the sound-absorbing layer.

[0017] Furthermore, the temperature adaptation specifically includes:

[0018] The temperature-sensitive filling material senses the rate of temperature change inside the vehicle. When the rate of temperature change exceeds a preset threshold, the temperature-sensitive filling material undergoes pre-deformation to buffer the temperature shock. When the temperature stabilizes, the temperature-sensitive filling material returns to the stiffness state corresponding to the current temperature.

[0019] Furthermore, the phase change temperature regulation specifically includes:

[0020] During the heat absorption process of the phase change layer, the temperature-sensitive filler material increases the interlocking gap to form a micro-convection channel between the sound-absorbing layer and the phase change layer, accelerating the lateral diffusion of heat; during the heat release process of the phase change layer, the temperature-sensitive filler material expands in volume during the phase change process, pushing the pore walls of the sound-absorbing layer to generate micro-cracks or pore expansion, forming an auxiliary heat dissipation channel; after the phase change is completed, it returns to a dense state.

[0021] Furthermore, it also includes adaptive sound insulation, specifically including:

[0022] When the interior temperature is higher than the phase transition temperature and the sound-absorbing layer is excited by high-frequency sound waves, the temperature-sensitive filling material hardens and compresses the sound-absorbing layer, thereby reducing the porosity and increasing the density of the sound-absorbing layer to improve the sound insulation effect; when the vehicle is traveling at low speed and the interior temperature decreases, the temperature-sensitive filling material softens and the sound-absorbing layer returns to a loose state to maintain its breathable sound absorption performance.

[0023] Implementing the embodiments of the present invention will have the following beneficial effects:

[0024] 1. In this embodiment, the automotive heat insulation and sound insulation pad has a raised structure on the bottom surface of the wear-resistant layer, which is distributed along the length of the wear-resistant layer. The top surface of the sound-absorbing layer has a grooved structure, which is distributed along the length of the sound-absorbing layer and is interlocked with the raised structure. The temperature-sensitive filling material is placed in the interlocking gap between the raised structure and the grooved structure and is in contact with the raised structure and the grooved structure. The phase change layer covers the bottom surface of the sound-absorbing layer, so that the temperature-sensitive filling material is in contact with the raised structure and the grooved structure to form a mechanical lock. The temperature-sensitive filling material deforms itself and releases thermal stress through temperature changes. The phase change layer maintains temperature stability through phase change reaction, thereby realizing the adaptive adjustment of the rigidity and flexibility of the interlayer connection. The temperature-responsive mechanical locking structure ensures connection reliability while releasing thermal stress, overcoming the problems of insufficient interlayer connection reliability and inability to release thermal stress caused by temperature changes in automotive heat insulation and sound insulation pads.

[0025] 2. The method of using the automotive heat insulation and sound insulation pad in this embodiment involves laying the pad on the car floor, with the phase change layer in contact with the floor and the wear-resistant layer facing upwards. Temperature adaptability is achieved, and the temperature-sensitive filling material deforms according to changes in the vehicle's interior temperature. When the temperature is below the phase change temperature, the filling material maintains a low-stiffness state, allowing slight relative slippage between the raised and recessed structures. When the temperature is above the phase change temperature, the filling material hardens to a high-stiffness state, with the raised and recessed structures rigidly interlocking. Phase change temperature regulation is achieved, where the phase change layer absorbs heat when the interior temperature rises to the phase change temperature and releases heat when the interior temperature drops below it. Sound insulation adaptability is also achieved, as the temperature-sensitive filling material adjusts the compression state of the sound-absorbing layer according to temperature changes, thereby altering the sound insulation performance of the sound-absorbing layer. This enables the automotive heat insulation and sound insulation pad to adaptively adjust under different temperatures and operating conditions, dynamically optimizing the interlayer connection stiffness and sound insulation performance with temperature changes, thus improving driving comfort and reducing energy consumption for interior temperature control. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the automotive heat insulation and sound insulation pad according to an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the automotive heat insulation and sound insulation pad described in an embodiment of the present invention;

[0029] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0030] Figure 4 for Figure 2 A magnified view of a section at point B in the middle;

[0031] Figure 5 This is a temperature-stiffness relationship curve of the temperature-sensitive material described in the embodiments of the present invention;

[0032] Figure 6 This is an overall structural diagram of the phase change layer described in an embodiment of the present invention;

[0033] Figure 7 This is an enlarged view of the phase change microcapsule structure of the phase change layer described in an embodiment of the present invention;

[0034] Figure 8 This is a temperature-stiffness variation curve as described in an embodiment of the present invention;

[0035] Figure 9 This is a graph showing the sound insulation performance versus temperature relationship as described in an embodiment of the present invention.

[0036] Figure 10 This is a flowchart illustrating the steps of the automotive heat insulation and sound insulation pad described in an embodiment of the present invention.

[0037] Among them: 100, automotive heat insulation and sound insulation pad; 110, wear-resistant layer; 111, raised structure; 120, sound-absorbing layer; 121, groove structure; 130, temperature-sensitive filling material; 131, fitting gap; 140, phase change layer; 150, anti-slip bottom layer; 160, edge sealing strip. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, 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. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] Please refer to Figures 1-9 This invention provides an automotive heat insulation and sound insulation pad 100. The automotive heat insulation and sound insulation pad 100 in this embodiment includes a wear-resistant layer 110, a sound-absorbing layer 120, a temperature-sensitive filling material 130, and a phase change layer 140. The bottom surface of the wear-resistant layer 110 has a raised structure 111, which is distributed along the length direction of the wear-resistant layer 110. The top surface of the sound-absorbing layer 120 has a groove structure 121, which is distributed along the length direction of the sound-absorbing layer 120, and the groove structure 121 is connected to the raised structure 140. The structure 111 is fitted together; the temperature-sensitive filling material 130 is disposed in the fitting gap 131 between the protruding structure 111 and the groove structure 121, and is in contact with the protruding structure 111 and the groove structure 121; the phase change layer 140 covers the bottom surface of the sound-absorbing layer 120; wherein, the temperature-sensitive filling material 130 forms a mechanical lock with the protruding structure 111 and the groove structure 121 in contact, and the temperature-sensitive filling material 130 deforms itself and releases thermal stress through temperature change; the phase change layer 140 maintains temperature stability through phase change reaction. In specific applications, the wear-resistant layer 110 is located on the top layer, and the raised structures 111 on the bottom surface of the wear-resistant layer 110 are continuously distributed along the length direction; the sound-absorbing layer 120 is located below the wear-resistant layer 110, and the groove structure 121 on the top surface of the sound-absorbing layer 120 interlocks with the raised structures 111 to form a mechanical interlocking interface; the temperature-sensitive filling material 130 is filled in the interlocking gap 131, and maintains contact with both the raised structures 111 and the groove structure 121. It expands or contracts in volume when the temperature changes, and adjusts the interlocking tightness through its own deformation; the phase change layer 140 is located below the sound-absorbing layer 120 and is in contact with the car floor. It absorbs or releases heat through a phase change reaction; the layers are combined by interlocking and covering to form an integral structure.

[0042] In one possible implementation, the temperature-sensitive filler 130 is shape memory polyurethane or shape memory epoxy resin; the temperature-sensitive filler 130 is covered by a flexible sealing film, which covers the temperature-sensitive filler 130, fills the remaining space of the interlocking gap 131, and isolates the temperature-sensitive filler 130 from the external environment. For specific applications, please refer to... Figure 5The temperature-sensitive filler material 130 preferably adopts a reverse phase transition design. Its molecular chain segments are in a highly elastic state below the phase transition temperature, exhibiting low stiffness characteristics, allowing micro-slippage between the protrusion structure 111 and the groove structure 121. Above the phase transition temperature, the hard molecular segments form crystalline regions or physical cross-linking points, and the material transforms into a hardened state, significantly increasing its stiffness, thus enabling a rigid interlocking between the protrusion structure 111 and the groove structure 121. A flexible sealing film tightly wraps the temperature-sensitive filler material 130, forming a flexible capsule. This flexible capsule is located within the interlocking gap 131, and the outer wall of the flexible capsule adheres to the surfaces of the protrusion structure 111 and the groove structure 121. This allows the temperature-sensitive filler material 130 to undergo volume changes during the phase transition process while isolating it from the external environment, preventing the intrusion of moisture and dust.

[0043] In one possible implementation, the sound-absorbing layer 120 is an open-cell polyurethane foam; the phase change layer 140 includes phase change microcapsules and a thermally conductive network, the phase change microcapsules encapsulating a paraffin-based phase change material; the thermally conductive network is expanded graphite or carbon fiber mesh. In specific applications, the sound-absorbing layer 120 uses an open-cell foam material, and the interior of the sound-absorbing layer 120 has a connected pore structure for absorbing in-vehicle noise. Please refer to [reference needed]. Figure 6 and Figure 7 Phase change layer 140 contains dispersed phase change microcapsules, which encapsulate materials capable of undergoing solid-liquid phase change at specific temperatures. The phase change temperature of the encapsulated paraffin-based phase change material is 25-35℃, used to store or release heat. A heat-conducting network runs through phase change layer 140, constructing an efficient heat-conducting channel. The heat-conducting network rapidly and evenly transfers the heat energy of the phase change microcapsules, avoiding local overheating.

[0044] In one possible implementation, the protrusion structure 111 is an arc-shaped protrusion, and the groove structure 121 is an arc-shaped groove that fits into the arc-shaped protrusion. In specific applications, the cross-sectional profiles of the arc-shaped protrusion and the arc-shaped groove are closed curves formed by the sequential connection of arc segments, and their radii of curvature match. During fitting, the arc-shaped protrusion is embedded in the arc-shaped groove, forming a surface contact fit. The contact area is significantly increased compared to planar fitting, thereby improving the reliability of mechanical locking. When the temperature-sensitive filler material 130 deforms, the arc-shaped interface allows for slight relative slippage to release shear stress, while the guiding effect of the arc-shaped structure prevents complete interlayer misalignment.

[0045] In one possible implementation, both the surface of the protrusion structure 111 and the surface of the groove structure 121 are covered with an elastic wear-resistant layer, which is a silicone gel. In specific applications, the elastic wear-resistant layer covers the contact surfaces of the protrusion structure 111 and the groove structure 121, forming a continuous elastic film layer. This elastic film layer acts as a stress buffer between the temperature-sensitive filler material 130 and the substrate. When thermal stress is generated by a rapid temperature change, the elastic wear-resistant layer absorbs part of the stress through its own deformation, preventing the temperature-sensitive filler material 130 from peeling off from the substrate. At the same time, the low surface energy characteristics of the elastic wear-resistant layer reduce the friction coefficient of the interlocking interface, making micro-slippage smoother at low temperatures and mechanical locking tighter at high temperatures.

[0046] In one possible implementation, the system further includes an anti-slip base layer 150 and an edge sealing strip 160. The anti-slip base layer 150 is disposed on the bottom surface of the phase change layer 140 and has a grid-like anti-slip texture and a buffer cavity. The edge sealing strip 160 surrounds the edges of the wear-resistant layer 110, the sound-absorbing layer 120, and the phase change layer 140. The edge sealing strip 160 is a hollow rubber strip filled with a water-absorbing and expanding material. In specific applications, the anti-slip base layer 150 is located below the phase change layer 140 and contacts the car floor. Its bottom surface has a grid-like anti-slip texture, and buffer cavities are provided at the grid nodes. The buffer cavities deform under pressure to provide cushioning and recover under negative pressure to provide adsorption force. The edge sealing strip 160 is fixed to the edge of the heat insulation and sound insulation pad 100. When it comes into contact with water, the water-absorbing and expanding material inside expands rapidly, increasing the volume of the sealing strip and tightly filling the gap between the heat insulation and sound insulation pad 100 and the vehicle floor, preventing liquid from seeping into the interlayer. At the same time, the hollow structure of the edge sealing strip 160 remains soft when it does not absorb water, making it easy for the edge of the heat insulation and sound insulation pad 100 to be bent to fit the contour of the vehicle body.

[0047] Please refer to Figure 10 and combined Figures 1 to 9 This invention provides a method for using an automotive heat insulation and sound insulation pad 100, which is applied to the aforementioned automotive heat insulation and sound insulation pad 100, and includes the following steps:

[0048] S1. Installation: Lay the car heat insulation and sound insulation pad 100 on the car floor, so that the phase change layer 140 is in contact with the car floor and the wear layer 110 is facing upwards.

[0049] S2. Temperature Adaptive: The temperature-sensitive filling material 130 deforms according to changes in the vehicle interior temperature. When the temperature is below the phase transition temperature, the temperature-sensitive filling material 130 maintains a low-stiffness state, allowing slight relative slippage between the raised structure 111 and the groove structure 121. When the temperature is above the phase transition temperature, the temperature-sensitive filling material 130 hardens to form a high-stiffness state, with the raised structure 111 and the groove structure 121 rigidly engaged.

[0050] S3, Phase change temperature regulation: The phase change layer 140 absorbs heat when the temperature inside the vehicle rises to the phase change temperature, and releases heat when the temperature inside the vehicle drops below the phase change temperature.

[0051] S4. Adaptive sound insulation: The temperature-sensitive filling material 130 adjusts the compression state of the sound-absorbing layer 120 according to temperature changes to alter its sound insulation performance. In practical applications, during installation, it is fixed to the edge of the car floor via a snap-fit ​​structure, ensuring full contact between the phase change layer 140 and the floor for heat conduction. The phase change temperature of the temperature-sensitive filling material 130 is set within the range of human comfort temperatures. When the interior temperature is low, the material maintains low stiffness, allowing the driver to experience a soft cushioning effect when stepping on it. When the interior temperature is high, the material hardens to provide high-stiffness support. The phase change layer 140 absorbs heat during vehicle exposure to direct sunlight, delaying the temperature rise inside the vehicle, and releases heat during nighttime cooling, delaying the temperature drop. When the temperature-sensitive filling material 130 hardens at high temperatures, it expands in volume, compressing the sound-absorbing layer 120, reducing its porosity and increasing its density, thereby improving its sound insulation performance against mid-to-high frequency noise.

[0052] In one possible implementation, temperature adaptation specifically includes:

[0053] The temperature-sensitive filler material 130 senses the rate of temperature change inside the vehicle. When the rate of temperature change exceeds a preset threshold, the temperature-sensitive filler material 130 undergoes pre-deformation to buffer temperature shocks. Once the temperature stabilizes, the temperature-sensitive filler material 130 returns to its stiffness state corresponding to the current temperature. In specific applications, when a vehicle rapidly moves from a low-temperature underground parking garage onto a hot, exposed road surface, the interior temperature rises sharply in a short period. At this time, the temperature-sensitive filler material 130 senses that the rate of temperature change exceeds the preset threshold and begins pre-deformation before fully reaching the phase transition temperature. Through the viscoelastic properties of the material, it absorbs thermal shock energy, preventing sudden changes in hardness from causing discomfort to the driver. When the rate of temperature change decreases and persists for a period of time, the temperature-sensitive filler material 130 completes the phase transition, returning to its stiffness state corresponding to the current temperature, providing stable support.

[0054] In one possible implementation, phase change temperature regulation specifically includes:

[0055] During the heat absorption process of the phase change layer 140, the temperature-sensitive filler material 130 forms a micro-convection channel between the sound-absorbing layer 120 and the phase change layer 140 by increasing the interlocking gap 131, accelerating the lateral diffusion of heat. During the heat release process of the phase change layer 140, the temperature-sensitive filler material 130 expands in volume during the phase change, pushing the pore walls of the sound-absorbing layer 120 to generate micro-cracks or pore expansion, forming auxiliary heat dissipation channels. After the phase change is completed, it returns to a dense state. For specific applications, please refer to [reference needed]. Figures 8-9When the interior temperature rises to a high level, the temperature-sensitive filling material 130 transforms from a low-stiffness state to a high-stiffness state, shrinking in volume. This causes local gaps to appear in the originally fully filled interlocking gaps 131. These gaps form transversely connected micro-convection channels between the sound-absorbing layer 120 and the phase change layer 140, promoting the transverse flow of hot air for heat dissipation. When the temperature drops to a low level, the temperature-sensitive filling material 130 softens and expands in volume, embedding itself in the micropores on the surface of the sound-absorbing layer 120. Through mechanical extrusion, reversible microcracks are generated in the pore walls. These microcracks increase the scattering path of sound waves inside the material, thereby improving the low-frequency sound absorption performance. When the temperature stabilizes near the phase change temperature, the temperature-sensitive filling material 130 remains in a semi-hardened state, maintaining both mechanical locking and appropriate buffering.

[0056] In one possible implementation, sound insulation adaptiveness is also included, specifically comprising:

[0057] When the interior temperature is higher than the phase transition temperature and the sound-absorbing layer 120 is excited by high-frequency sound waves, the temperature-sensitive filling material 130 hardens and compresses the sound-absorbing layer 120, thereby reducing the porosity and increasing the density of the sound-absorbing layer 120 to improve the sound insulation effect; when the vehicle is traveling at low speed and the interior temperature decreases, the temperature-sensitive filling material 130 softens and the sound-absorbing layer 120 returns to a loose state to maintain its breathable sound absorption performance. In practical applications, when a vehicle is traveling at high speed, road noise and tire noise are mainly mid-to-high frequency. If the interior temperature is higher than the phase transition temperature, the temperature-sensitive filling material 130 hardens and applies continuous pressure to the sound-absorbing layer 120, causing the pores of the sound-absorbing layer 120 to be partially compressed, increasing the material's equivalent density, increasing the propagation speed of sound waves in the material, improving impedance matching, and significantly improving the sound insulation of mid-to-high frequency noise. When the vehicle is traveling at low speed or parked, the interior temperature gradually decreases to below the phase transition temperature, the temperature-sensitive filling material 130 softens, the compressive stress on the sound-absorbing layer 120 is released, and the pores return to a loose state. At this time, the material's sound absorption coefficient for low-frequency noise increases, and its breathability is improved, avoiding the stuffy feeling of the heat insulation-sound insulation pad 100. This coupling adjustment of temperature sensitivity and acoustics achieves an adaptive effect of being firm and sound-insulating at high speeds and soft and comfortable at low speeds.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A car heat insulation and sound insulation pad, characterized in that, include: A wear-resistant layer, wherein the bottom surface of the wear-resistant layer is provided with a raised structure, and the raised structure is distributed along the length direction of the wear-resistant layer; The sound-absorbing layer has a groove structure on its top surface, the groove structure is distributed along the length direction of the sound-absorbing layer, and the groove structure is fitted with the protrusion structure; A temperature-sensitive filling material is disposed in the fitting gap between the protruding structure and the groove structure, and is in contact with the protruding structure and the groove structure; A phase change layer, the phase change layer covering the bottom surface of the sound-absorbing layer; The temperature-sensitive filler material contacts the protruding structure and the groove structure to form a mechanical lock, and the temperature-sensitive filler material deforms itself and releases thermal stress through temperature changes; the phase change layer maintains temperature stability through a phase change reaction.

2. The automotive heat insulation and sound insulation pad according to claim 1, characterized in that, The temperature-sensitive filler material is shape memory polyurethane or shape memory epoxy resin; the temperature-sensitive filler material is covered by a flexible sealing film, which covers the temperature-sensitive filler material, fills the remaining space of the interlocking gap, and isolates the temperature-sensitive filler material from the external environment.

3. The automotive heat insulation and sound insulation pad according to claim 2, characterized in that, The sound-absorbing layer is an open-cell polyurethane foam; the phase change layer includes phase change microcapsules and a thermally conductive network, wherein the phase change microcapsules encapsulate paraffin-based phase change materials; and the thermally conductive network is expanded graphite or carbon fiber mesh.

4. The automotive heat insulation and sound insulation pad according to claim 3, characterized in that, The protrusion structure is an arc-shaped protrusion, and the groove structure is an arc-shaped groove that fits into the arc-shaped protrusion.

5. The automotive heat insulation and sound insulation pad according to claim 4, characterized in that, Both the surface of the protruding structure and the surface of the groove structure are covered with an elastic wear-resistant layer, which is a silicone body.

6. The automotive heat insulation and sound insulation pad according to claim 5, characterized in that, It also includes an anti-slip bottom layer and an edge sealing strip. The anti-slip bottom layer is located on the bottom surface of the phase change layer and has a grid-like anti-slip texture and a buffer cavity. The edge sealing strip is arranged around the edge of the wear-resistant layer, the sound-absorbing layer and the phase change layer. The edge sealing strip is a hollow rubber strip and is filled with water-absorbing and expanding material.

7. A method of using an automotive heat insulation and sound insulation mat, applied to the heat insulation and sound insulation mat as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Installation: Lay the automotive heat insulation and sound insulation pad on the car floor, so that the phase change layer is in contact with the car floor and the wear-resistant layer faces upward; S2. Temperature Adaptive: The temperature-sensitive filling material deforms according to changes in the vehicle interior temperature. When the temperature is below the phase transition temperature, the temperature-sensitive filling material maintains a low-stiffness state, and slight relative slippage is allowed between the protruding structure and the groove structure. When the temperature is above the phase transition temperature, the temperature-sensitive filling material hardens to form a high-stiffness state, and the protruding structure and the groove structure are rigidly engaged. S3, Phase change temperature regulation: The phase change layer absorbs heat when the temperature inside the vehicle rises to the phase change temperature, and releases heat when the temperature inside the vehicle drops below the phase change temperature. S4. Adaptive sound insulation: The temperature-sensitive filling material adjusts the compression state of the sound-absorbing layer according to temperature changes to change the sound insulation performance of the sound-absorbing layer.

8. The method of using the automotive heat insulation and sound insulation pad according to claim 7, characterized in that, The temperature adaptive feature specifically includes: The temperature-sensitive filling material senses the rate of temperature change inside the vehicle. When the rate of temperature change exceeds a preset threshold, the temperature-sensitive filling material undergoes pre-deformation to buffer the temperature shock. When the temperature stabilizes, the temperature-sensitive filling material returns to the stiffness state corresponding to the current temperature.

9. The method of using the automotive heat insulation and sound insulation pad according to claim 8, characterized in that, The phase change temperature regulation specifically includes: During the heat absorption process of the phase change layer, the temperature-sensitive filler material increases the interlocking gap to form a micro-convection channel between the sound-absorbing layer and the phase change layer, accelerating the lateral diffusion of heat; during the heat release process of the phase change layer, the temperature-sensitive filler material expands in volume during the phase change process, pushing the pore walls of the sound-absorbing layer to generate micro-cracks or pore expansion, forming an auxiliary heat dissipation channel; after the phase change is completed, it returns to a dense state.

10. The method of using the automotive heat insulation and sound insulation pad according to claim 9, characterized in that, It also includes adaptive sound insulation, specifically including: When the interior temperature is higher than the phase transition temperature and the sound-absorbing layer is excited by high-frequency sound waves, the temperature-sensitive filling material hardens and compresses the sound-absorbing layer, thereby reducing the porosity and increasing the density of the sound-absorbing layer to improve the sound insulation effect; when the vehicle is traveling at low speed and the interior temperature decreases, the temperature-sensitive filling material softens and the sound-absorbing layer returns to a loose state to maintain its breathable sound absorption performance.

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