Heat insulation pads and vehicles equipped with them

Abstract

This application relates to the field of vehicle component technology and provides a heat insulation pad and a vehicle equipped with it. The heat insulation pad of this application has a foam layer and a carbon fiber layer located on one side of the foam layer. The carbon fiber layer comprises woven carbon fiber yarns and forms the outer surface layer of the heat insulation pad. A sound-absorbing structure for absorbing noise is provided within the foam layer. The heat insulation pad of this application can provide heat insulation while also having good sound absorption performance, thus improving its quality of use.

Description

Technical Field

[0001] This application relates to the field of vehicle component technology, and in particular to a heat insulation pad and a vehicle equipped with it. Background Technology

[0002] In vehicles, especially in the engine compartment, the engine operates at high temperatures. To prevent the engine's high-temperature radiation from adversely affecting other components, heat insulation pads are typically installed in the engine compartment to isolate the heat radiation. However, current heat insulation pads, in order to address heat resistance issues, are covered with aluminum foil. The presence of aluminum foil makes it difficult for the heat insulation pad to effectively absorb sound waves, thus reducing its sound absorption performance and hindering the improvement of its overall quality. Utility Model Content

[0003] In view of this, the present application aims to provide a heat insulation pad that improves its performance.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: An insulation pad having a foam layer and a carbon fiber layer located on one side of the foam layer; The carbon fiber layer comprises carbon fiber yarns woven together, and the carbon fiber layer forms the outer layer of the heat insulation pad, and a sound-absorbing structure for absorbing noise is provided in the foam layer.

[0005] Furthermore, the carbon fiber layer is made of a carbon fiber mesh woven from the carbon fiber yarn; and / or, The foam layer is made of polyimide foam.

[0006] Furthermore, the sound-absorbing structure includes a Helmholtz cavity structure and / or an acoustic black hole structure disposed in the foam layer.

[0007] Furthermore, the Helmholtz cavity structure includes a resonant cavity and a communication port formed in the foam layer; One end of the connecting port is connected to the resonant cavity, and the other end of the connecting port opens on the side of the foam layer facing the carbon fiber layer, and the volume of the connecting port is smaller than the volume of the resonant cavity.

[0008] Furthermore, the acoustic black hole structure includes a structural body disposed within the foam layer; The structure body is sheet-like and includes a main body and branch portions connected to two opposite sides of the main body; Each of the branch portions is elongated, and both the main body and the branch portions are provided with a plurality of sound-permeable holes arranged in an array.

[0009] Furthermore, the sound-permeable holes on both the main body and the branch portion are filled with rubber particles.

[0010] Furthermore, in each of the branch portions, at least one of the branch portions has a different length than the other branch portions.

[0011] Furthermore, the heat insulation pad has a sound-absorbing felt layer; The sound-absorbing felt layer is located on the side of the foam layer opposite to the carbon fiber layer, and the sound-absorbing felt layer includes fiberglass felt.

[0012] Furthermore, the heat insulation pad has a non-woven fabric layer; The nonwoven fabric layer is located on the side of the sound-absorbing felt layer that is opposite to the foam layer.

[0013] Compared with related technologies, this application has the following advantages: (1) The heat insulation pad described in this application, by setting a foam layer and a carbon fiber layer, and making the carbon fiber layer constitute the outer surface layer of the heat insulation pad, and setting a sound-absorbing structure for absorbing noise in the foam layer, can not only utilize the excellent high temperature resistance and heat insulation performance of the carbon fiber layer and the foam layer to ensure the heat insulation effect of the heat insulation pad, but also utilize the sparse and porous characteristics of the carbon fiber layer and the foam layer to effectively absorb noise and ensure the sound absorption performance of the heat insulation pad, thereby helping to improve the quality of use of the heat insulation pad.

[0014] (2) The carbon fiber layer uses carbon fiber mesh, which can make the carbon fiber layer have better mechanical properties, better protect the foam layer, and help improve the stability of the sound insulation pad structure.

[0015] The foam layer is made of polyimide foam, which gives it high heat resistance and a high open-cell ratio, ensuring its sound absorption performance under high-temperature conditions.

[0016] (3) The sound-absorbing structure adopts the Helmholtz cavity structure and the acoustic black hole structure, which can achieve a good sound absorption effect through the consumption of noise energy and the synergistic effect with the soft and porous foam layer.

[0017] (4) The Helmholtz cavity structure includes a resonant cavity and a connecting port set in the foam layer. It has a simple structure, is easy to form, and can also effectively consume noise energy to achieve sound absorption effect.

[0018] (5) The acoustic black hole structure includes a sheet-like structural body, which has a main body and connected branch parts, and is provided with sound-permeable holes. The structure can consume noise energy through the vibration of the structure under noise excitation, and achieve sound absorption effect.

[0019] (6) Filling the sound-permeable hole with rubber particles can utilize the resonance between the rubber particles and the transmitted noise energy in a specific frequency band to effectively cancel the noise energy, which is beneficial to improving the sound absorption effect of the acoustic black hole structure.

[0020] (7) The different lengths of the branches not only result in different vibration frequencies of the branches, thus absorbing noise of different wavelengths, but also cause energy disturbances in the porous structure of the surrounding foam layer to varying degrees, so that the noise energy is fully transmitted and consumed in the pores of the foam layer, which helps to amplify the sound absorption performance of the foam layer and is conducive to ensuring the sound absorption performance of the acoustic black hole structure.

[0021] (8) By setting a sound-absorbing felt layer including fiberglass felt, on the one hand, the fiberglass felt can be used to further consume and absorb the emitted noise, thereby improving the sound absorption effect of the heat insulation pad. On the other hand, the lightweight nature of the fiberglass felt can be utilized to reduce the overall weight of the sound insulation pad without affecting the sound absorption performance, compared with the traditional PU structure.

[0022] (9) By setting a non-woven fabric layer, the non-woven fabric can be used to improve the overall performance of the sound insulation pad by taking advantage of its good oil resistance, sound insulation and heat insulation properties, as well as the ability to form a stable structural layer after hot pressing.

[0023] Another object of this application is to provide a vehicle in which the engine compartment is provided with the heat insulation pad described above.

[0024] By employing the heat insulation pad described above, the vehicle described in this application can achieve good heat insulation and sound absorption effects on the engine when it is running. This reduces the impact of high-temperature radiation from the engine on surrounding components and also reduces the transmission of engine noise to the passenger compartment, thereby improving the quality of vehicle use. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of the heat insulation pad described in the embodiments of this application; Figure 2 This is a schematic diagram illustrating the arrangement of the sound-absorbing structure in the foam layer according to an embodiment of this application; Figure 3 This is a schematic diagram of the acoustic black hole structure described in the embodiments of this application; Figure 4 for Figure 3 Enlarged view of section A; Explanation of reference numerals in the attached figures: 1. Foam layer; 2. Carbon fiber layer; 3. Sound-absorbing felt layer; 4. Non-woven fabric layer; 11. Helmholtz cavity structure; 111. Resonance cavity; 112. Connecting port; 120. Structural body; 121. Main body; 122. Branching part; 123. Sound transmission hole; 124. Rubber particles. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0032] An embodiment of the first aspect of this application provides a heat insulation pad, which is generally used in vehicles and can be specifically installed in the engine compartment of a vehicle to insulate heat sources such as the engine in the engine compartment. At the same time, through its innovative structural design, the heat insulation pad of this embodiment can not only insulate heat but also have good sound absorption performance, which helps to improve its quality of use.

[0033] In related technologies, heat insulation pads are installed in the engine compartment of vehicles to isolate the high-temperature radiation generated during engine operation, preventing adverse effects on surrounding components. Furthermore, with the increasing popularity of hybrid vehicles, the engine compartment needs to house both the engine and drive motor. Due to limited space, the gaps between components in the engine compartment are small, which places higher demands on the heat insulation performance of the heat insulation pads.

[0034] In traditional designs, to improve the heat insulation capacity of the heat insulation pad and to solve the heat resistance problem, aluminum foil is usually covered on the surface of the heat insulation pad.

[0035] However, the presence of aluminum foil not only obstructs the original sparse and porous nature of the heat insulation pad, making it difficult for sound waves to enter the pad and be effectively absorbed, thus reducing the pad's sound absorption performance, but also easily causes noise refraction, creating a reverberation field in the engine compartment. This negatively impacts the vehicle's NVH (Noise, Vibration, Harshness) performance and hinders the improvement of the heat insulation pad's quality.

[0036] In view of this, in order to overcome the shortcomings of related technologies, the heat insulation pad in this embodiment combines... Figures 1 to 4 As shown, the overall design includes a foam layer 1 and a carbon fiber layer 2 located on one side of the foam layer 1.

[0037] The carbon fiber layer 2 comprises carbon fiber yarns woven together, and the carbon fiber layer 2 forms the outer layer of the heat insulation pad. At the same time, a sound-absorbing structure for absorbing noise is also provided in the foam layer 1.

[0038] Therefore, as described above, by setting a foam layer 1 and a carbon fiber layer 2 in the heat insulation pad, with the carbon fiber layer 2 forming the outer layer of the heat insulation pad, and setting a sound-absorbing structure for absorbing noise in the foam layer 1, this embodiment can utilize the excellent high-temperature resistance and heat insulation properties of the carbon fiber layer 2 and the foam layer 1 to ensure the heat insulation effect of the heat insulation pad. At the same time, it can also utilize the sparse and porous characteristics of the carbon fiber layer 2 and the foam layer 1 to effectively absorb noise, thus ensuring the sound absorption performance of the heat insulation pad and improving the quality of use of the heat insulation pad.

[0039] Based on the above overview, specifically, carbon fiber yarn is a yarn made by twisting multiple carbon fiber monofilaments together. It has high strength and modulus, and maintains good flexibility and weaving properties. At the same time, it also has high temperature resistance, corrosion resistance and wear resistance.

[0040] Thus, the carbon fiber layer 2 in this embodiment not only has a temperature resistance of up to 400°C and can play a good heat insulation role as the outer layer of the heat insulation pad, but also effectively protects the foam layer 1 by covering it, thereby improving the structural stability of the heat insulation pad.

[0041] In specific implementations, the carbon fiber layer 2 of this embodiment can adopt any feasible carbon fiber yarn weaving form. Furthermore, in some exemplary embodiments, this embodiment may, for example, make the carbon fiber layer 2 a carbon fiber mesh fabric woven from carbon fiber yarn.

[0042] Thus, by using carbon fiber mesh for carbon fiber layer 2, it is understood that this enables carbon fiber layer 2 to have better mechanical properties, better protect foam layer 1, and help improve the stability of the sound insulation pad structure.

[0043] When carbon fiber layer 2 is made of carbon fiber mesh woven from carbon fiber yarn, the specific specifications can be selected by those skilled in the art based on the overall design requirements of the thermal insulation pad. For example, a common 200g / m³ carbon fiber mesh can be used. 2 Or 300g / m 2 Carbon fiber mesh fabric of the same specifications.

[0044] In this embodiment, in some exemplary implementations, the foam layer 1 may be, for example, a polyimide foam.

[0045] Polyimide foam is a soft or rigid porous material with polyimide resin as the matrix and open, closed or mixed pore structure inside. The thermal decomposition temperature of polyimide foam can reach 550℃, and the material's properties will not change at high temperatures. At the same time, the open cell ratio of polyimide foam is higher than 96%, which also enables it to have good sound absorption performance under high temperature conditions.

[0046] Therefore, by using polyimide foam for foam layer 1, it can be understood that this embodiment enables foam layer 1 to have high heat resistance and high open cell ratio, which can ensure the sound absorption performance of foam layer 1 under high temperature conditions, thereby helping to improve the performance of foam layer 1.

[0047] It is worth noting that, in practical implementation, besides using polyimide foam for foam layer 1, polyurethane foam or melamine foam can also be used for foam layer 1 based on cost considerations. However, the temperature resistance of polyurethane foam and melamine foam is lower than that of polyimide foam, so polyimide foam is still the preferred choice.

[0048] Furthermore, in this embodiment, based on the use of polyimide foam for the foam layer 1, in some exemplary embodiments, the sound-absorbing structure specifically includes a Helmholtz cavity structure 11 and an acoustic black hole structure 12 disposed in the foam layer 1.

[0049] At this point, the sound-absorbing structure adopts the Helmholtz cavity structure 11 and the acoustic black hole structure 12. Obviously, by utilizing the sound-absorbing characteristics of the Helmholtz cavity structure 11 and the acoustic black hole structure 12, a better sound-absorbing effect can be achieved through the consumption of noise energy and the synergistic effect with the soft and porous foam layer 1.

[0050] Furthermore, in specific implementation, we will continue to combine Figure 2 As shown, in some exemplary embodiments, the Helmholtz cavity structure 11 described above includes, for example, a resonant cavity 111 and a communication port 112 formed in the foam layer 1.

[0051] One end of the connecting port 112 is connected to the resonant cavity 111, and the other end of the connecting port 112 opens on the side of the foam layer 1 facing the carbon fiber layer 2. The volume of the connecting port 112 is also smaller than the volume of the resonant cavity 111 to form the desired Helmholtz cavity shape.

[0052] It is understandable that the Helmholtz cavity structure 11 includes a resonant cavity 111 and a connecting port 112 disposed in the foam layer 1. Its structure is simple and easy to form, and it can also effectively dissipate noise energy, thus facilitating the sound absorption effect of the sound absorption structure.

[0053] In specific implementation, it is worth noting that the above-mentioned Helmholtz cavity structure 11 can generally be formed by topologically arraying some recessed features on the foam layer 1 using a mold, and these recessed features are all small cylindrical openings connected to cavities with larger internal volumes, thus forming the connecting opening 112 and the resonant cavity 111, thereby obtaining each Helmholtz cavity structure 11.

[0054] Moreover, when noise is transmitted into the Helmholtz cavity structure 11, the change in pressure at the neck position between the connecting port 112 and the resonant cavity 111 causes the air inside the resonant cavity 111 to vibrate, which can cancel out the transmitted noise energy, thereby achieving the purpose of consuming noise energy.

[0055] Meanwhile, since the inner wall of the resonant cavity 111 is made of polyimide foam, the polyimide foam can also act as a damping soft body to absorb noise by utilizing its sparse porous structure and soft texture and damping properties, thus enabling the Helmholtz cavity structure 11 to have a good sound absorption effect.

[0056] In this embodiment, in some exemplary implementations, the following continues to be combined Figures 2 to 4 As shown, the acoustic black hole structure 12 specifically includes a structural body 120 disposed in the foam layer 1. The structural body 120 is sheet-like and includes a main body 121 and branch portions 122 respectively connected to two opposite sides of the main body 121.

[0057] Each branch 122 is elongated, and several sound-permeable holes 123 are arranged in an array on both the main body 121 and each branch 122.

[0058] At this point, it can be understood that the acoustic black hole structure 12 includes a sheet-like structural body 120, and the structural body 120 has a main body 121 and connected branch parts 122, and a sound-permeable hole 123 is provided on it. The noise energy can be consumed by the vibration of the structural body 120 under noise excitation, so as to achieve the sound absorption effect of the sound-absorbing structure.

[0059] Furthermore, in some exemplary embodiments of this embodiment, the sound-permeable holes 123 on the main body portion 121 and the branch portion 122 may also be filled with rubber particles 124.

[0060] Therefore, by filling the sound-permeable hole 123 with rubber particles 124, the rubber particles 124 can resonate with the transmitted noise energy in a specific frequency band (generally below 5000Hz), effectively canceling the noise energy, which is beneficial to better improve the sound absorption effect of the acoustic black hole structure 12.

[0061] It is worth noting that, in specific implementation, the sheet-like structural body 120 can be made of thin-walled sheet metal, and its thickness can be, for example, 0.1 mm, 0.2 mm or other values.

[0062] The aperture of the sound-permeable hole 123 in the above array can generally be set between 1-2 mm. The distance between adjacent sound-permeable holes 123 is not limited, and can be, for example, between 5 mm and 10 mm or other values. Meanwhile, the rubber particles 123 can be, for example, common EPDM (Ethylene Propylene Diene Monomer) colloidal particles.

[0063] Meanwhile, the pore size of each sound-permeable hole 123 can be the same, and based on this, the particle size of the filled rubber particles 124 is also the same. However, in addition to making the pore size of each sound-permeable hole 123 and the particle size of each rubber particle 124 the same, in some other embodiments, for example, the sound-permeable holes 123 on the structural body 120 can have different pore sizes, and correspondingly, the filled rubber particles 124 can have different particle sizes.

[0064] By making the sound-permeable holes 123 have different pore sizes and the filled rubber particles 124 have different particle sizes, compared to making the pore sizes of each sound-permeable hole 123 and the particle sizes of each rubber particle 124 the same, the absorption of noise of different wavelengths can be achieved by utilizing the different vibration frequencies between the rubber particles 124 of different sizes, thus enabling the acoustic black hole structure 12 to have a better sound absorption effect.

[0065] In this embodiment, it is worth noting that, in specific implementation, the sound-absorbing structure in the foam layer 1 includes a Helmholtz cavity structure 11 and an acoustic black hole structure 12, see [link to relevant documentation]. Figure 2 As shown, the acoustic black hole structure 12 can be placed in the foam layer 1 from the other side of the foam layer 1, for example, relative to the opening side of the Helmholtz cavity structure 11.

[0066] Moreover, still with Figure 2 Taking the cross-section of the foam layer 1 shown as an example, in a specific design, the acoustic black hole structure 12 can be distributed around the Helmholtz cavity structure 11, that is, the acoustic black hole structure 12 is set between adjacent Helmholtz cavity structures 11. In this way, the absorption effect of the sound-absorbing structure in the foam layer 1 can be fully utilized to obtain a good sound absorption effect.

[0067] In addition to including both the Helmholtz cavity structure 11 and the acoustic black hole structure 12 in the sound-absorbing structure of the foam layer 1, it is also feasible to include only the Helmholtz cavity structure 11 or the acoustic black hole structure 12 in the foam layer 1 in a specific implementation.

[0068] In this embodiment, in specific implementations, some exemplary embodiments still refer to... Figure 3 As shown, the branch portions 122 located on each side of the main body portion 121 may, for example, have different lengths.

[0069] In this way, by making the lengths of the branch portions 122 different, not only can the vibration frequencies of the branch portions 122 be different, thus absorbing noise of different wavelengths, but also the energy disturbance of the surrounding porous structure of the foam layer can be caused to varying degrees, so that the noise energy can be fully transmitted and consumed inside the pores of the foam layer 1, which helps to amplify the sound absorption performance of the foam layer 1 and helps to ensure the sound absorption performance of the acoustic black hole structure 12.

[0070] It is worth pointing out that, in addition to, Figure 3 As shown, the lengths of the branch portions 122 on each side are different. Of course, in other embodiments, for example, some branch portions 122 on each side may have the same length. That is, in specific implementation, at least one branch portion 122 on each side has a different length than the other branch portions 122. Of course, it is still preferred that the lengths of the branch portions 122 on each side are different to give the acoustic black hole structure 12 a better sound absorption effect.

[0071] Continue as Figure 1 As shown, in some exemplary embodiments of this embodiment, the heat insulation pad also has a sound-absorbing felt layer 3 located on the side of the foam layer 1 opposite to the carbon fiber layer 2, and the sound-absorbing felt layer 3 also includes fiberglass felt.

[0072] At this point, by setting a sound-absorbing felt layer 3 including fiberglass felt, on the one hand, the fiberglass felt can be used to further consume and absorb the emitted noise, which can improve the sound absorption effect of the heat insulation pad. On the other hand, the lightweight nature of the fiberglass felt can be utilized, which, compared with the traditional PU (polyurethane) structure, is conducive to reducing the overall weight of the sound insulation pad without affecting the sound absorption performance.

[0073] Furthermore, in specific implementation, it is worth noting that the sound-absorbing felt layer 3 can generally be made solely of fiberglass felt to fully utilize its lightweight properties and achieve a better weight reduction effect. However, depending on specific design needs, it is also possible for the sound-absorbing felt layer 3 to include other types of sound-absorbing felt in addition to fiberglass felt; this embodiment does not impose any limitations on this.

[0074] In this embodiment, it remains the same. Figure 1 As shown, in some exemplary embodiments, the heat insulation pad also has a nonwoven fabric layer 4 located on the side of the sound-absorbing felt layer 3 facing away from the foam layer 1.

[0075] At this point, by further adding a non-woven fabric layer 4, the overall performance of the sound insulation pad can be improved by utilizing the non-woven fabric's good resistance to oil stains and its sound and heat insulation properties, as well as its ability to form a stable structural layer after hot pressing.

[0076] It is worth noting that, regarding the heat insulation pad of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made by... Figures 1 to 4 As shown, it has, for example, a carbon fiber layer 2, a foam layer 1, a sound-absorbing felt layer 3, and a non-woven fabric layer 4 arranged sequentially.

[0077] The carbon fiber layer 2 forms the outer layer of the heat insulation pad, and is made of carbon fiber mesh woven from carbon fiber yarn. The foam layer 1 is made of polyimide foam, and includes a sound-absorbing structure for absorbing noise. This sound-absorbing structure includes a Helmholtz cavity structure 11 and acoustic black hole structures 12 arranged around the Helmholtz cavity structure 11. The sound-absorbing felt layer 3 is made of fiberglass felt.

[0078] Specifically, the Helmholtz cavity structure 11 includes a resonant cavity 111 and a connecting port 112 formed in the foam layer 1. One end of the connecting port 112 is connected to the resonant cavity 111, and the other end of the connecting port 112 opens on the side of the foam layer 1 facing the carbon fiber layer 2. The volume of the connecting port 112 is smaller than the volume of the resonant cavity 111.

[0079] Furthermore, the acoustic black hole structure 12 specifically includes a sheet-like structural body 120, which also includes a main body 121 and branch portions 122 connected to opposite sides of the main body 121. Each branch portion 122 is elongated and has an array of sound-permeable holes 123 arranged on the main body 121 and the branch portions 122. Each sound-permeable hole 123 is filled with rubber particles 124, and the lengths of the branch portions 122 on each side are different.

[0080] In the preferred embodiment of the above heat insulation pad, the specific settings and arrangements of the carbon fiber layer 2, foam layer 1, sound-absorbing felt layer 3, and sound-absorbing structures in foam layer 1 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the carbon fiber layer 2, foam layer 1, sound-absorbing felt layer 3, and sound-absorbing structures in foam layer 1 can also be referred to the descriptions in the above exemplary embodiments.

[0081] In addition, in the specific preparation process, the heat insulation pad of this embodiment can generally be formed by hot pressing after the carbon fiber layer 2, foam layer 1, sound-absorbing felt layer 3 and non-woven fabric layer 4 are laid out, so as to form a heat insulation pad as a whole.

[0082] Furthermore, during the preparation process, the rubber particles 124 in the acoustic black hole structure 12 can be fixed to the sound-transmitting holes 123 by vulcanization after the structural body 120 constituting the acoustic black hole structure 12 is formed.

[0083] Meanwhile, taking the application in the engine compartment of a vehicle as an example, the thickness of the heat insulation pad in this embodiment is usually between 20mm and 30mm. Taking the thickness of the heat insulation pad as 25mm as an example, in specific implementation, for example, the thickness of the foam layer 1 can be between 10mm and 15mm, the thickness of the sound-absorbing felt layer 3 can be 10mm, and the thickness of the carbon fiber layer 2 and the non-woven fabric layer 4 can be between 1mm and 2mm.

[0084] The heat insulation pad of this embodiment adopts the above design. By setting a foam layer 1 and a carbon fiber layer 2, with the carbon fiber layer 2 forming the outer layer of the heat insulation pad, and setting a sound-absorbing structure composed of a Helmholtz cavity structure 11 and an acoustic black hole structure 12 in the foam layer 1, it can not only utilize the excellent high temperature resistance and heat insulation performance of the carbon fiber layer 2 and the foam layer 1 to ensure the heat insulation effect of the heat insulation pad, but also utilize the sparse and porous characteristics of the carbon fiber layer 2 and the foam layer 1, as well as the sound-absorbing structure to effectively absorb noise, thus ensuring the sound absorption performance of the heat insulation pad and helping to improve the quality of use of the heat insulation pad.

[0085] An embodiment of the second aspect of this application provides a vehicle in which a heat insulation pad as described in the first aspect embodiment is provided in the engine compartment.

[0086] In specific implementation, the arrangement of the heat insulation pad in the engine compartment can refer to the conventional arrangement of heat insulation pads in existing traditional fuel vehicles or hybrid vehicles. As long as it can effectively isolate the high temperature radiation of the engine (and drive motor, etc.) when it is working, and can also effectively absorb the vibration and noise generated by the engine (and drive motor, etc.) when it is working, it is acceptable.

[0087] The vehicle in this embodiment, by using the heat insulation pad described above, can provide good heat insulation and sound absorption for the engine when it is running. This can reduce the impact of high-temperature radiation from the engine on surrounding components and reduce the transmission of engine noise to the passenger compartment, thus improving the overall quality of the vehicle.

[0088] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.

Claims

1. A heat insulation pad, characterized in that: The heat insulation pad has a foam layer (1) and a carbon fiber layer (2) located on one side of the foam layer (1). The carbon fiber layer (2) comprises carbon fiber yarns woven together, and the carbon fiber layer (2) constitutes the outer layer of the heat insulation pad, and a sound-absorbing structure for absorbing noise is provided in the foam layer (1).

2. The heat insulation pad according to claim 1, characterized in that: The carbon fiber layer (2) is made of carbon fiber mesh woven from the carbon fiber yarn; and / or, The foam layer (1) is made of polyimide foam.

3. The heat insulation pad according to claim 1, characterized in that: The sound-absorbing structure includes a Helmholtz cavity structure (11) and / or an acoustic black hole structure (12) disposed in the foam layer (1).

4. The heat insulation pad according to claim 3, characterized in that: The Helmholtz cavity structure (11) includes a resonant cavity (111) and a communication port (112) formed in the foam layer (1). One end of the connecting port (112) is connected to the resonant cavity (111), and the other end of the connecting port (112) opens on the side of the foam layer (1) facing the carbon fiber layer (2), and the volume of the connecting port (112) is smaller than the volume of the resonant cavity (111).

5. The heat insulation pad according to claim 3, characterized in that: The acoustic black hole structure (12) includes a structural body (120) disposed in the foam layer (1). The structural body (120) is sheet-shaped and includes a main body (121) and branch portions (122) connected to two opposite sides of the main body (121). Each of the branch portions (122) is elongated, and both the main body portion (121) and the branch portions (122) are provided with a plurality of sound-permeable holes (123) arranged in an array.

6. The heat insulation pad according to claim 5, characterized in that: The sound-permeable holes (123) on the main body (121) and the branch (122) are filled with rubber particles (124).

7. The heat insulation pad according to claim 5, characterized in that: In each of the branch portions (122) on each side, the length of at least one of the branch portions (122) is different from the length of the other branch portions (122).

8. The heat insulation pad according to any one of claims 1 to 7, characterized in that: The heat insulation pad has a sound-absorbing felt layer (3); The sound-absorbing felt layer (3) is located on the side of the foam layer (1) opposite to the carbon fiber layer (2), and the sound-absorbing felt layer (3) includes fiberglass felt.

9. The heat insulation pad according to claim 8, characterized in that: The heat insulation pad has a non-woven fabric layer (4); The nonwoven fabric layer (4) is located on the side of the sound-absorbing felt layer (3) that is opposite to the foam layer (1).

10. A vehicle, characterized in that: The vehicle's engine compartment is provided with a heat insulation pad as described in any one of claims 1 to 9.

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